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Affiliation(s)
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), UMR 8214 CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay Cedex, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires (ISM), CNRS, Univ. Bordeaux, 351 cours de la Libération, 33400 Talence, France
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52
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Gans B, Lamarre N, Guillemin JC, Douin S, Alcaraz C, Romanzin C, Garcia GA, Liévin J, Boyé-Péronne S. Vibronic structure of the cyanobutadiyne cation. I. VUV photoionization study of HC 5N. J Chem Phys 2019; 150:244304. [DOI: 10.1063/1.5097688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS UMR 8214, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Nicolas Lamarre
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS UMR 8214, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Jean-Claude Guillemin
- Univ. Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR-UMR6226, F-35000 Rennes, France
| | - Stéphane Douin
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS UMR 8214, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Christian Alcaraz
- Laboratoire de Chimie Physique, CNRS UMR 8000, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Claire Romanzin
- Laboratoire de Chimie Physique, CNRS UMR 8000, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, Saint Aubin F-91192, Gif-sur-Yvette, France
| | - Jacques Liévin
- Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, CP 160/09, B-1050 Bruxelles, Belgium
| | - Séverine Boyé-Péronne
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS UMR 8214, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
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53
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Hrodmarsson HR, Thissen R, Dowek D, Garcia GA, Nahon L, Govers TR. Isotope Effects in the Predissociation of Excited States of N 2 + Produced by Photoionization of 14N 2 and 15N 2 at Energies Between 24.2 and 25.6 eV. Front Chem 2019; 7:222. [PMID: 31032247 PMCID: PMC6474291 DOI: 10.3389/fchem.2019.00222] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 03/21/2019] [Indexed: 12/03/2022] Open
Abstract
Photoelectron/photoion imaging spectrometry employing dispersed VUV radiation from the SOLEIL synchrotron has been used to study the predissociation of N2 + states located up to 1.3 eV above the ion's first dissociation limit. Branching ratios for unimolecular decay into either N2 + or N+ were obtained by measuring coincidences between threshold electrons and mass-selected product ions, using a supersonic beam of either 14N2 or 15N2 as photoionization target. The results confirm that predissociation of the C 2 Σ u + state of 14N2 + is faster than emission to the electronic ground-state by a factor 10 or more for all vibrational levels v' ≥ 3, while for 15N2 + the two decay modes have comparable probabilities for the levels v' = 3, 4, and 5. In contrast, no significant isotope effect could be observed for the other states of N2 + identified in the photoelectron spectrum. For both 14N2 + and 15N2 + isotopologues all vibrational levels of these other states decay to an extent of at least 95% by predissociation.
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Affiliation(s)
- Helgi R. Hrodmarsson
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, Gif-sur-Yvette, France
| | - Roland Thissen
- Laboratoire de Chimie Physique, Université Paris-Sud, Orsay, France
| | - Danielle Dowek
- Institut des Sciences Moléculaires, Université Paris-Sud, Orsay, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, Gif-sur-Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin BP 48, Gif-sur-Yvette, France
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54
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Abouljoud MM, Alvand A, Boscainos P, Chen AF, Garcia GA, Gehrke T, Granger J, Kheir M, Kinov P, Malo M, Manrique J, Meek D, Meheux C, Middleton R, Montilla F, Reed M, Reisener MJ, van der Rijt A, Rossmann M, Spangehl M, Stocks G, Young P, Young S, Zahar A, Zhang X. Hip and Knee Section, Prevention, Operating Room Environment: Proceedings of International Consensus on Orthopedic Infections. J Arthroplasty 2019; 34:S293-S300. [PMID: 30343970 DOI: 10.1016/j.arth.2018.09.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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55
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Gans B, Garcia GA, Boyé-Péronne S, Pratt ST, Guillemin JC, Aguado A, Roncero O, Loison JC. Origin band of the first photoionizing transition of hydrogen isocyanide. Phys Chem Chem Phys 2019; 21:2337-2344. [PMID: 30656348 PMCID: PMC6469576 DOI: 10.1039/c8cp07737a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photoelectron spectrum of the X1Σ+ → X+2Σ+ ionizing transition of hydrogen isocyanide (HNC) is measured for the first time at a fixed photon energy (13 eV). The assignment of the spectrum is supported by wave-packet calculations simulating the photoionization transition spectrum and using ab initio calculations of the potential energy surfaces for the three lowest electronic states of the cation. The photoelectron spectrum allows the retrieval of the fundamental of the CN stretching mode of the cationic ground state ([small nu, Greek, tilde]3 = 2260 ± 80 cm-1) and the adiabatic ionization energy of hydrogen isocyanide: IE(HNC) = 12.011 ± 0.010 eV, which is far below that of HCN (IE(HCN) = 13.607 eV). In light of this latter result, the thermodynamics of the HCN+/HNC+ isomers is discussed and a short summary of the values available in the literature is given.
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Affiliation(s)
- Bérenger Gans
- Institut des Sciences Moléculaires d'Orsay (ISMO), UMR 8214 CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France.
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56
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Hrodmarsson HR, Garcia GA, Nahon L, Loison JC, Gans B. The absolute photoionization cross section of the mercapto radical (SH) from threshold up to 15.0 eV. Phys Chem Chem Phys 2019; 21:25907-25915. [DOI: 10.1039/c9cp05809e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present the absolute photoionization cross-section of the mercapto radical, SH, recorded from its first ionization energy at 10.4 eV up to a photon energy of 15 eV.
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Affiliation(s)
| | | | - Laurent Nahon
- Synchrotron SOLEIL
- L’Orme des Merisiers
- Gif sur Yvette
- France
| | | | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO)
- UMR 8214 CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay Cedex
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57
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Schleier D, Humeniuk A, Reusch E, Holzmeier F, Nunez-Reyes D, Alcaraz C, Garcia GA, Loison JC, Fischer I, Mitric R. Diborene: Generation and Photoelectron Spectroscopy of an Inorganic Biradical. J Phys Chem Lett 2018; 9:5921-5925. [PMID: 30234995 DOI: 10.1021/acs.jpclett.8b02338] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Diborenes, R-BB-R', are of current interest in inorganic chemistry because they offer the opportunity to tune the properties of a biradical by modifying the substituents of the diborene parent, HBBH. Here we synthesize the elusive diborene by H atom abstraction from diborane, B2H6, using fluorine atoms and report a vibrationally resolved photoelectron spectrum of the HBBH biradical. The spectrum is interpreted by comparison with high-level ab initio computations, taking into account the Renner-Teller splitting in the X+ 2Π ionic ground state, which show an excellent agreement with the experimental spectrum. An adiabatic ionization energy of 9.080 ± 0.015 eV was determined, and a vibrational progression in the boron-boron stretching vibration of 0.14 eV is visible. This is due to the reduction of bond order upon ionization, accompanied by an increase of the computed boron-boron bond length, RBB, from 1.514 to 1.606 Å.
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Affiliation(s)
- Domenik Schleier
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Alexander Humeniuk
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Engelbert Reusch
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Fabian Holzmeier
- Institut des Sciences Moléculaires d'Orsay, CNRS, Bât. 520 Université Paris-Sud and Paris-Saclay , F-91405 Orsay Cedex , France
| | - Dianailys Nunez-Reyes
- ISM-CNRS, Université de Bordeaux , 351 cours de la Libération , F-33405 Talence , France
| | - Christian Alcaraz
- LCP, UMR 800, CNRS-Univ. Paris-Sud and Paris Saclay, Bât. 350, Centre Universitaire Paris-Sud , F-91405 Orsay Cedex , France
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers , St Aubin, B.P. 48 , F-91192 Gif sur Yvette , France
| | - Jean-Christophe Loison
- ISM-CNRS, Université de Bordeaux , 351 cours de la Libération , F-33405 Talence , France
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
| | - Roland Mitric
- Institute of Physical and Theoretical Chemistry , University of Würzburg , Am Hubland, D-97074 Würzburg , Germany
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58
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Zhao HY, Lau KC, Garcia GA, Nahon L, Carniato S, Poisson L, Schwell M, Al-Mogren MM, Hochlaf M. Unveiling the complex vibronic structure of the canonical adenine cation. Phys Chem Chem Phys 2018; 20:20756-20765. [PMID: 29989120 DOI: 10.1039/c8cp02930j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Adenine, a DNA base, exists as several tautomers and isomers that are closely lying in energy and that may form a mixture upon vaporization of solid adenine. Indeed, it is challenging to bring adenine into the gas phase, especially as a unique tautomer. The experimental conditions were tuned to prepare a jet-cooled canonical adenine (9H-adenine). This isolated DNA base was ionized by single VUV photons from a synchrotron beamline and the corresponding slow photoelectron spectrum was compared to ab initio computations of the neutral and ionic species. We report the vibronic structure of the X+ 2A'' (D0), A+ 2A' (D1) and B+ 2A'' (D2) electronic states of the 9H adenine cation, from the adiabatic ionization energy (AIE) up to AIE + 1.8 eV. Accurate AIEs are derived for the 9H-adenine (X[combining tilde] 1A') + hν → 9H-adenine+ (X+ 2A'', A+ 2A', B+ 2A'') + e- transitions. Close to the AIE, we fully assign the rich vibronic structure solely to the 9H-adenine (X 1A') + hν → 9H-adenine+ (X+ 2A'') transition. Importantly, we show that the lowest cationic electronic states of canonical adenine are coupled vibronically. The present findings are important for understanding the effects of ionizing radiation and the charge distribution on this elementary building block of life, at ultrafast, short, and long timescales.
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Affiliation(s)
- Hong Yan Zhao
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong
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59
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Shafizadeh N, Boyé-Péronne S, Soorkia S, Cunha de Miranda BK, Garcia GA, Nahon L, Chen S, de la Lande A, Poisson L, Soep B. The surprisingly high ligation energy of CO to ruthenium porphyrins. Phys Chem Chem Phys 2018; 20:11730-11739. [PMID: 29687125 DOI: 10.1039/c8cp01190g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined theoretical and experimental approach has been used to investigate the binding energy of a ruthenium metalloporphyrin ligated with CO, ruthenium tetraphenylporphyrin [RuII TPP], in the RuII oxidation degree. Measurements performed with VUV ionization using the DESIRS beamline at Synchrotron SOLEIL led to adiabatic ionization energies of [RuII TPP] and its complex with CO, [RuII TPP-CO], of 6.48 ± 0.03 eV and 6.60 ± 0.03 eV, respectively, while the ion dissociation threshold of [RuII TPP-CO]+ is measured to be 8.36 ± 0.03 eV using the ground-state neutral complex. These experimental data are used to derive the binding energies of the CO ligand in neutral and cationic complexes (1.88 ± 0.06 eV and 1.76 ± 0.06 eV, respectively) using a Born-Haber cycle. Density functional theory calculations, in very satisfactory agreement with the experimental results, help to get insights into the metal-ligand bond. Notably, the high ligation energies can be rationalized in terms of the ruthenium orbital structure, which is singular compared to that of the iron atom. Thus, beyond indications of a strengthening of the Ru-CO bond due to the decrease in the CO vibrational frequency in the complex as compared to the Fe-CO bond, high-level calculations are essential to accurately describe the metal ligand (CO) bond and show that the Ru-CO bond energy is strongly affected by the splitting of triplet and singlet spin states in uncomplexed [Ru TPP].
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Affiliation(s)
- Niloufar Shafizadeh
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, Université Paris-Sud, Orsay F-91405, France.
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60
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Rafiee Fanood MM, Ganjitabar H, Garcia GA, Nahon L, Turchini S, Powis I. Intense Vibronic Modulation of the Chiral Photoelectron Angular Distribution Generated by Photoionization of Limonene Enantiomers with Circularly Polarized Synchrotron Radiation. Chemphyschem 2018; 19:921-933. [PMID: 29266631 DOI: 10.1002/cphc.201701248] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Indexed: 11/11/2022]
Abstract
Photoionization of the chiral monoterpene limonene has been investigated using polarized synchrotron radiation between the adiabatic ionization threshold, 8.505 and 23.5 eV. A rich vibrational structure is seen in the threshold photoelectron spectrum and is interpreted using a variety of computational methods. The corresponding photoelectron circular dichroism-measured in the photoelectron angular distribution as a forward-backward asymmetry with respect to the photon direction-was found to be strongly dependent on the vibronic structure appearing in the photoelectron spectra, with the observed asymmetry even switching direction in between the major vibrational peaks. This effect can be ultimately attributed to the sensitivity of this dichroism to small phase shifts between adjacent partial waves of the outgoing photoelectron. These observations have implications for potential applications of this chiroptical technique, where the enantioselective analysis of monoterpene components is of particular interest.
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Affiliation(s)
- Mohammad M Rafiee Fanood
- LaserLaB Amsterdam, VU University Amsterdam, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands.,Current address: Department of Imaging Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Hassan Ganjitabar
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Gustavo A Garcia
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif sur Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif sur Yvette Cedex, France
| | - Stefano Turchini
- Istituto Struttura della Materia-CNR (ISM-CNR), Via del Fosso del Cavaliere 100, 00133, Roma, Italy
| | - Ivan Powis
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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61
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Tang X, Garcia GA, Nahon L. New insights onto dissociation of state-selected O2+ ions investigated by double imaging photoelectron photoion coincidence: The superimposed 32Πu and c4Σu− inner-valence states. J Chem Phys 2018; 148:124309. [DOI: 10.1063/1.5011046] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xiaofeng Tang
- Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031 Anhui, China
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
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62
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Affiliation(s)
- Laurent H. Coudert
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS–Université de Bordeaux, Bât. A12, 351 Cours de la Libération, F-33405 Talence Cedex, France
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63
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Garcia GA, Gans B, Krüger J, Holzmeier F, Röder A, Lopes A, Fittschen C, Alcaraz C, Loison JC. Valence shell threshold photoelectron spectroscopy of C3Hx (x = 0–3). Phys Chem Chem Phys 2018. [DOI: 10.1039/c8cp00510a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present the photoelectron spectra of C3Hx (x = 0–3) formed in a microwave discharge flow-tube reactor by consecutive H abstractions from C3H4 (C3Hx + F → C3Hx−1 + HF (x = 1–4)), but also from F + CH4 schemes by secondary reactions.
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Affiliation(s)
| | | | - Julia Krüger
- Synchrotron SOLEIL
- L'Orme des Merisiers
- Gif sur Yvette
- France
| | - Fabian Holzmeier
- Synchrotron SOLEIL
- L'Orme des Merisiers
- Gif sur Yvette
- France
- Laboratoire de Chimie Physique d'Orsay
| | - Anja Röder
- Synchrotron SOLEIL
- L'Orme des Merisiers
- Gif sur Yvette
- France
| | - Allan Lopes
- CNRS – Université Paris-Sud et Paris-Saclay
- Laboratoire de Chimie Physique
- UMR 8000
- Centre Universitaire Paris-Sud
- 91405 Orsay
| | | | - Christian Alcaraz
- CNRS – Université Paris-Sud et Paris-Saclay
- Laboratoire de Chimie Physique
- UMR 8000
- Centre Universitaire Paris-Sud
- 91405 Orsay
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64
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Abstract
The cyano radical is a ubiquitous molecule and was, for instance, one of the first species detected in astrophysical media such as comets or diffuse clouds. In photodissociation regions, the reaction rate of CN+ + CO → CN + CO+ is one of the critical parameters defining nitrile chemistry. The enthalpy of this charge transfer reaction is defined as the difference of ionization energies (EI) between CN and CO. Although EI(CO) is known accurately, the EI(CN) values are more dispersed and deduced indirectly from thermodynamic thresholds only, all above EI(CO), leading to the assumption that the reaction is fast even at low temperature. Using a combination of synchrotron radiation, electron/ion imaging coincidence techniques, and supporting ab initio calculations, we directly determine the first adiabatic ionization energy of CN at 13.956(7) eV, and we demonstrate that EI(CN) < EI(CO). The findings suggest a very slow reaction in the cold regions of interstellar media.
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Affiliation(s)
- Bérenger Gans
- Institut des Sciences Moléculaires d'Orsay (ISMO), UMR 8214 CNRS, Univ. Paris-Sud, Université Paris-Saclay , F-91405 Orsay, France
| | - Séverine Boyé-Péronne
- Institut des Sciences Moléculaires d'Orsay (ISMO), UMR 8214 CNRS, Univ. Paris-Sud, Université Paris-Saclay , F-91405 Orsay, France
| | - Gustavo A Garcia
- Synchrotron SOLEIL , L'Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Anja Röder
- Institute of Physical and Theoretical Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
| | - Domenik Schleier
- Institute of Physical and Theoretical Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
| | - Philippe Halvick
- Institut des Sciences Moléculaires, UMR 5255 CNRS-Université de Bordeaux , Bât. A12, 351 cours de la Libération, F-33405 Talence Cedex, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS-Université de Bordeaux , Bât. A12, 351 cours de la Libération, F-33405 Talence Cedex, France
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65
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Tang X, Garcia GA, Nahon L. Double Imaging Photoelectron Photoion Coincidence Sheds New Light on the Dissociation of State-Selected CH3F+ Ions. J Phys Chem A 2017; 121:5763-5772. [DOI: 10.1021/acs.jpca.7b06038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaofeng Tang
- Laboratory of Atmospheric
Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031 Anhui, China
- Synchrotron SOLEIL, L’Orme des Merisiers,
St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers,
St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers,
St. Aubin BP 48, 91192 Gif sur Yvette, France
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66
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Daly S, Powis I, Garcia GA, Tia M, Nahon L. An imaging photoelectron-photoion coincidence investigation of homochiral 2R,3R-butanediol clusters. J Chem Phys 2017; 147:013937. [PMID: 28688422 DOI: 10.1063/1.4983139] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report an experimental investigation of homochiral cluster formation in seeded molecular beam expansions of (2R,3R)-butanediol. Synchrotron radiation vacuum ultraviolet photoionization measurements have been performed using a double imaging electron-ion spectrometer in various configurations and modes of operation. These include measurements of the cluster ion mass spectra, wavelength scanned ion yields, and threshold electron spectra. Protonated cluster ions ranging up to n = 7 have been observed and size-selected photoelectron spectra and photoelectron circular dichroism (PECD) have been recorded by velocity map imaging, recorded in coincidence with ions, at a number of fixed photon energies. Translation temperatures of the cluster ions have been further examined by ion imaging measurements. As well as the sequence of protonated clusters with integral numbers of butanediol monomer units, a second series with half-integral monomer masses is observed and deduced to result from a facile cleavage of a butanediol monomer moiety within the nascent cluster. This second sequence of half-integral masses displays quite distinct behaviours. PECD measurements are used to show that the half-integral mass cluster ions do not share a common parentage with whole integer masses. Using an analogy developed with simple theoretical calculations of butanediol dimer structures, it is inferred that the dissociative branching into integral and half-integral ion mass sequences is controlled by the presence of different butanediol monomer conformations within the hydrogen bonded clusters.
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Affiliation(s)
- Steven Daly
- School of Chemistry, University of Nottingham, University Park NG7 2RD, Nottingham, United Kingdom
| | - Ivan Powis
- School of Chemistry, University of Nottingham, University Park NG7 2RD, Nottingham, United Kingdom
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
| | - Maurice Tia
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
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Garcia GA, Krüger J, Gans B, Falvo C, Coudert LH, Loison JC. Valence shell threshold photoelectron spectroscopy of the CHxCN (x = 0-2) and CNC radicals. J Chem Phys 2017; 147:013908. [DOI: 10.1063/1.4978336] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Julia Krüger
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Cyril Falvo
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Laurent H. Coudert
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS—Université de Bordeaux, Bât. A12, 351 Cours de la Libération, F-33405 Talence Cedex, France
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Hartweg S, Yoder BL, Garcia GA, Nahon L, Signorell R. Size-Resolved Photoelectron Anisotropy of Gas Phase Water Clusters and Predictions for Liquid Water. Phys Rev Lett 2017; 118:103402. [PMID: 28339280 DOI: 10.1103/physrevlett.118.103402] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Indexed: 05/05/2023]
Abstract
We report the first measurements of size-resolved photoelectron angular distributions for the valence orbitals of neutral water clusters with up to 20 molecules. A systematic decrease of the photoelectron anisotropy is found for clusters with up to 5-6 molecules, and most remarkably, convergence of the anisotropy for larger clusters. We suggest the latter to be the result of a local short-range scattering potential that is fully described by a unit of 5-6 molecules. The cluster data and a detailed electron scattering model are used to predict the anisotropy of slow photoelectrons in liquid water. Reasonable agreement with experimental liquid jet data is found.
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Affiliation(s)
- Sebastian Hartweg
- Department of Chemistry and Applied Biosciences, Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
| | - Bruce L Yoder
- Department of Chemistry and Applied Biosciences, Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette, France
| | - Ruth Signorell
- Department of Chemistry and Applied Biosciences, Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
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69
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Garcia GA, Dossmann H, Nahon L, Daly S, Powis I. Identifying and Understanding Strong Vibronic Interaction Effects Observed in the Asymmetry of Chiral Molecule Photoelectron Angular Distributions. Chemphyschem 2017; 18:500-512. [PMID: 27973748 DOI: 10.1002/cphc.201601250] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 12/11/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Gustavo A. Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers; St. Aubin BP 48 91192 Gif sur Yvette France
| | - Héloïse Dossmann
- Synchrotron SOLEIL, L'Orme des Merisiers; St. Aubin BP 48 91192 Gif sur Yvette France
- Current address: Sorbonne Universités; UPMC Univ Paris 06, CNRS, Institut Parisien de Chimie Moléculaire (IPCM); 4 Place Jussieu 75252 Paris Cedex 05 France
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers; St. Aubin BP 48 91192 Gif sur Yvette France
| | - Steven Daly
- School of Chemistry; University of Nottingham; Nottingham NG7 2RD UK
- Current address: Institut Lumiere Matière, UMR5306, CNRS; Université Lyon 1; 69622 Villeurbanne France
| | - Ivan Powis
- School of Chemistry; University of Nottingham; Nottingham NG7 2RD UK
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70
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Gans B, Garcia GA, Holzmeier F, Krüger J, Röder A, Lopes A, Fittschen C, Loison JC, Alcaraz C. Communication: On the first ionization threshold of the C 2H radical. J Chem Phys 2017; 146:011101. [PMID: 28063431 DOI: 10.1063/1.4973383] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The slow photoelectron spectrum of the ethynyl radical has been recorded for the first time by using the DESIRS beamline of the SOLEIL synchrotron facility. Ethynyl was generated using a microwave discharge flow tube. The observation of the X+Π3←XΣ+2 transition allowed the first direct measurement of the adiabatic ionization threshold of this radical (EI = 11.641(5) eV). The experimental results are supported by ab initio calculations. Our preliminary investigation of the cationic ground state potential energy surfaces predicts a non-negligible Renner-Teller effect which has not been discussed previously.
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Affiliation(s)
- B Gans
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - G A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - F Holzmeier
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - J Krüger
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - A Röder
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - A Lopes
- Laboratoire de Chimie Physique, UMR 8000 CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, Bât. 350, Centre Universitaire Paris-Sud, F-91405 Orsay Cedex, France
| | - C Fittschen
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - J-C Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS, Université de Bordeaux, Bât. A12, 351 cours de la Libération, F-33405 Talence Cedex, France
| | - C Alcaraz
- Laboratoire de Chimie Physique, UMR 8000 CNRS, Univ. Paris-Sud, Univ. Paris-Saclay, Bât. 350, Centre Universitaire Paris-Sud, F-91405 Orsay Cedex, France
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71
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Chen Z, Lau KC, Garcia GA, Nahon L, Božanić DK, Poisson L, Al-Mogren MM, Schwell M, Francisco JS, Bellili A, Hochlaf M. Identifying Cytosine-Specific Isomers via High-Accuracy Single Photon Ionization. J Am Chem Soc 2016; 138:16596-16599. [DOI: 10.1021/jacs.6b10413] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Ziyong Chen
- Department
of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Kai-Chung Lau
- Department
of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’orme des
Merisiers, Saint-Aubin
- BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’orme des
Merisiers, Saint-Aubin
- BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Dušan K. Božanić
- Synchrotron SOLEIL, L’orme des
Merisiers, Saint-Aubin
- BP 48, 91192 Gif-sur-Yvette Cedex, France
| | - Lionel Poisson
- LIDYL,
CEA, CNRS, Université Paris-Saclay, CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - Muneerah Mogren Al-Mogren
- Chemistry
Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - Martin Schwell
- Laboratoire
Interuniversitaire des Systèmes Atmosphériques (LISA),
UMR 7583 CNRS, Universités Paris-Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - Joseph S. Francisco
- Department
of Chemistry, University of Nebraska-Lincoln. 433 Hamilton Hall, Lincoln, Nebraska 68588-0304, United States
| | - Ayad Bellili
- Laboratoire
Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est. 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - Majdi Hochlaf
- Laboratoire
Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est. 5 bd Descartes, 77454 Marne-la-Vallée, France
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72
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Daly S, Tia M, Garcia GA, Nahon L, Powis I. The Interplay Between Conformation and Absolute Configuration in Chiral Electron Dynamics of Small Diols. Angew Chem Int Ed Engl 2016; 55:11054-8. [PMID: 27445202 DOI: 10.1002/anie.201603771] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 05/21/2016] [Indexed: 11/07/2022]
Abstract
A competition between chiral characteristics alternatively attributable to either conformation or to absolute configuration is identified. Circular dichroism associated with photoexcitation of the outer orbital of configurational enantiomers of 1,3- and 2,3-butanediols has been examined with a focus on the large changes in electron chiral asymmetry produced by different molecular conformations. Experimental gas-phase measurements offer support for the theoretical modeling of this chiroptical effect. A surprising prediction is that a conformationally produced pseudo-enantiomerism in 1,3-butanediol generates a chiral response in the frontier electron dynamics that outweighs the influence of the permanent configurational handedness established at the asymmetrically substituted carbon. Induced conformation, and specifically induced conformational chirality, may thus be a dominating factor in chiral molecular recognition in such systems.
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Affiliation(s)
- Steven Daly
- School of Chemistry, University Park, University of Nottingham, Nottingham, NG7 2RD, UK.,Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif sur Yvette Cedex, France.,Institut Lumiere Matière, UMR5306, CNRS, Université Lyon 1, 69622, Villeurbanne, France
| | - Maurice Tia
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif sur Yvette Cedex, France.,Institut für Kernphysik, Johann Wolfgang Goethe Universität, Max-von-Laue-Strasse 1, 60438, Frankfurt am Main, Germany
| | - Gustavo A Garcia
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif sur Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192, Gif sur Yvette Cedex, France
| | - Ivan Powis
- School of Chemistry, University Park, University of Nottingham, Nottingham, NG7 2RD, UK.
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73
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Cunha de Miranda B, Garcia GA, Gaie-Levrel F, Mahjoub A, Gautier T, Fleury B, Nahon L, Pernot P, Carrasco N. Molecular Isomer Identification of Titan’s Tholins Organic Aerosols by Photoelectron/Photoion Coincidence Spectroscopy Coupled to VUV Synchrotron Radiation. J Phys Chem A 2016; 120:6529-40. [PMID: 27471793 DOI: 10.1021/acs.jpca.6b03346] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Barbara Cunha de Miranda
- Synchrotron SOLEIL, DESIRS Beamline, L’Orme des Merisiers, St Aubin, 91192 Gif-sur-Yvette Cedex, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, DESIRS Beamline, L’Orme des Merisiers, St Aubin, 91192 Gif-sur-Yvette Cedex, France
| | - François Gaie-Levrel
- Synchrotron SOLEIL, DESIRS Beamline, L’Orme des Merisiers, St Aubin, 91192 Gif-sur-Yvette Cedex, France
- Gas
and Aerosol Metrology Department, Chemistry and Biology
Division, Laboratoire National de Métrologie et d’Essais − LNE (National Metrology Institute and Testing Laboratory), 1 rue Gaston
Boissier, 75724 Paris Cedex 15, France
| | - Ahmed Mahjoub
- Université Versailles St-Quentin; Sorbonne Universités, UPMC Université Paris 06, CNRS/INSU, LATMOS-IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, France
| | - Thomas Gautier
- Université Versailles St-Quentin; Sorbonne Universités, UPMC Université Paris 06, CNRS/INSU, LATMOS-IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, France
- NASA Postdoctoral Program, GSFC, Greenbelt, Maryland 20771, United States
| | - Benjamin Fleury
- Université Versailles St-Quentin; Sorbonne Universités, UPMC Université Paris 06, CNRS/INSU, LATMOS-IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, France
| | - Laurent Nahon
- Synchrotron SOLEIL, DESIRS Beamline, L’Orme des Merisiers, St Aubin, 91192 Gif-sur-Yvette Cedex, France
| | - Pascal Pernot
- Laboratoire de
Chimie Physique, UMR8000 CNRS/Université Paris-Sud, 91405 Orsay Cedex, France
| | - Nathalie Carrasco
- Université Versailles St-Quentin; Sorbonne Universités, UPMC Université Paris 06, CNRS/INSU, LATMOS-IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, France
- Institut Universitaire de France, 103 Boulevard St-Michel, 75005 Paris, France
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74
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Daly S, Tia M, Garcia GA, Nahon L, Powis I. The Interplay Between Conformation and Absolute Configuration in Chiral Electron Dynamics of Small Diols. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201603771] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Steven Daly
- School of Chemistry; University Park, University of Nottingham; Nottingham NG7 2RD UK
- Synchrotron SOLEIL, l'Orme des Merisiers; Saint Aubin BP 48 91192 Gif sur Yvette Cedex France
- Institut Lumiere Matière, UMR5306, CNRS, Université Lyon 1; 69622 Villeurbanne France
| | - Maurice Tia
- Synchrotron SOLEIL, l'Orme des Merisiers; Saint Aubin BP 48 91192 Gif sur Yvette Cedex France
- Institut für Kernphysik; Johann Wolfgang Goethe Universität; Max-von-Laue-Strasse 1 60438 Frankfurt am Main Germany
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, l'Orme des Merisiers; Saint Aubin BP 48 91192 Gif sur Yvette Cedex France
| | - Laurent Nahon
- Synchrotron SOLEIL, l'Orme des Merisiers; Saint Aubin BP 48 91192 Gif sur Yvette Cedex France
| | - Ivan Powis
- School of Chemistry; University Park, University of Nottingham; Nottingham NG7 2RD UK
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Felsmann D, Lucassen A, Krüger J, Hemken C, Tran LS, Pieper J, Garcia GA, Brockhinke A, Nahon L, Kohse-Höinghaus K. Progress in Fixed-Photon-Energy Time-Efficient Double Imaging Photoelectron/Photoion Coincidence Measurements in Quantitative Flame Analysis. Z PHYS CHEM 2016. [DOI: 10.1515/zpch-2016-0760] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Photoelectron photoion coincidence (PEPICO) spectroscopy as an attractive new technique for
combustion analysis was used in a fixed-photon-energy configuration to provide quantitative
species profiles in laminar premixed flames. While such measurements are conventionally
performed with molecular-beam mass spectrometry (MBMS) using electron ionization (EI) or
vacuum ultraviolet (VUV) photoionization (PI) with synchrotron radiation, these techniques
have some limitations. The possibility to record photoelectron spectra (PES) simultaneously
with photoionization data, providing fingerprint information for reliable species
identification, presents a significant advantage of PEPICO spectroscopy especially in
complex reactive mixtures. The multiplex approach presented here, enhanced by the imaging
capabilities of the electron and ion detection in the so-called double-imaging PEPICO scheme
(i2PEPICO), provides, in different experimental situations, an
unprecedentedly detailed combustion analysis regarding both species identification and
quantification. Problems and perspectives of the present fixed-photon-energy PEPICO approach
will be discussed.
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Affiliation(s)
- Daniel Felsmann
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Arnas Lucassen
- Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
| | - Julia Krüger
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
| | - Christian Hemken
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Luc-Sy Tran
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Julia Pieper
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
| | - Andreas Brockhinke
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif-sur-Yvette, France
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76
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Nahon L, Nag L, Garcia GA, Myrgorodska I, Meierhenrich U, Beaulieu S, Wanie V, Blanchet V, Géneaux R, Powis I. Determination of accurate electron chiral asymmetries in fenchone and camphor in the VUV range: sensitivity to isomerism and enantiomeric purity. Phys Chem Chem Phys 2016; 18:12696-706. [DOI: 10.1039/c6cp01293k] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoelectron circular dichroism is a chiroptical effect able to distinguish isomers and to determine accurately the enantiopurity of chiral compounds.
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Affiliation(s)
- Laurent Nahon
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
| | - Lipsa Nag
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
| | | | - Iuliia Myrgorodska
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
- Institut de Chimie de Nice
| | - Uwe Meierhenrich
- Institut de Chimie de Nice
- UMR 7272 CNRS
- University Nice Sophia Antipolis
- 06108 Nice
- France
| | - Samuel Beaulieu
- Université de Bordeaux-CNRS-CEA
- CELIA
- UMR 5107
- 33405 Talence
- France
| | - Vincent Wanie
- Université de Bordeaux-CNRS-CEA
- CELIA
- UMR 5107
- 33405 Talence
- France
| | | | | | - Ivan Powis
- School of Chemistry
- University of Nottingham
- Nottingham NG7 2RD
- UK
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77
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Tang X, Lin X, Zhang W, Garcia GA, Nahon L. Double imaging photoelectron photoion coincidence sheds new light on the dissociation of energy-selected CH3Cl+ ions. Phys Chem Chem Phys 2016; 18:23923-31. [PMID: 27524637 DOI: 10.1039/c6cp04161b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dissociation mechanisms of CH3Cl+ have been probed to be state-specific and the umbrella mode of the CH3+ fragments is assigned.
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Affiliation(s)
- Xiaofeng Tang
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | - Xiaoxiao Lin
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | - Weijun Zhang
- Laboratory of Atmospheric Physico-Chemistry
- Anhui Institute of Optics and Fine Mechanics
- Chinese Academy of Sciences
- Hefei
- China
| | | | - Laurent Nahon
- Synchrotron SOLEIL
- L’Orme des Merisiers
- 91192 Gif sur Yvette
- France
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78
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Tang X, Garcia GA, Gil JF, Nahon L. Vacuum upgrade and enhanced performances of the double imaging electron/ion coincidence end-station at the vacuum ultraviolet beamline DESIRS. Rev Sci Instrum 2015; 86:123108. [PMID: 26724007 DOI: 10.1063/1.4937624] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report here the recent upgrade of the SAPHIRS permanent photoionization end-station at the DESIRS vacuum ultraviolet beamline of synchrotron SOLEIL, whose performances have been enhanced by installing an additional double-skimmer differential chamber. The smaller molecular beam profile obtained at the interaction region has increased the mass resolution of the double imaging photoelectron photoion coincidence (i(2)PEPICO) spectrometer, DELICIOUS III, installed in the photoionization chamber of the SAPHIRS endstation, by a factor of two, to M/ΔM ∼ 1700 (FWHM). The electron kinetic energy resolution offered by the velocity map imaging (VMI) part of the spectrometer has been improved down to 2.8% (ΔE/E) as we show on the N2 photoionization case in the double skimmer configuration. As a representative example of the overall state-of-the-art i(2)PEPICO performances, experimental results of the dissociation of state-selected O2(+)(B(2)∑(g)(-), v(+) = 0-6) molecular ions performed at the fixed photon energy of hν = 21.1 eV are presented.
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Affiliation(s)
- Xiaofeng Tang
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Jean-François Gil
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France
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79
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Krüger J, Garcia GA, Felsmann D, Moshammer K, Lackner A, Brockhinke A, Nahon L, Kohse-Höinghaus K. Photoelectron-photoion coincidence spectroscopy for multiplexed detection of intermediate species in a flame. Phys Chem Chem Phys 2015; 16:22791-804. [PMID: 25237782 DOI: 10.1039/c4cp02857k] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complex reactive processes in the gas phase often proceed via numerous reaction steps and intermediate species that must be identified and quantified to develop an understanding of the reaction pathways and establish suitable reaction mechanisms. Here, photoelectron-photoion coincidence (PEPICO) spectroscopy has been applied to analyse combustion intermediates present in a premixed fuel-rich (ϕ = 1.7) ethene-oxygen flame diluted with 25% argon, burning at a reduced pressure of 40 mbar. For the first time, multiplexing fixed-photon-energy PEPICO measurements were demonstrated in a chemically complex reactive system such as a flame in comparison with the scanning "threshold" TPEPICO approach used in recent pioneering combustion investigations. The technique presented here is capable of detecting and identifying multiple species by their cations' vibronic fingerprints, including radicals and pairs or triplets of isomers, from a single time-efficient measurement at a selected fixed photon energy. Vibrational structures for these species have been obtained in very good agreement with scanning-mode threshold photoelectron spectra taken under the same conditions. From such spectra, the temperature in the ionisation volume was determined. Exemplary analysis of species profiles and mole fraction ratios for isomers shows favourable agreement with results obtained by more common electron ionisation and photoionisation mass spectrometry experiments. It is expected that the multiplexing fixed-photon-energy PEPICO technique can contribute effectively to the analysis of chemical reactivity and kinetics in and beyond combustion.
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Affiliation(s)
- Julia Krüger
- Department of Chemistry, Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany.
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80
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Garcia GA, Tang X, Gil JF, Nahon L, Ward M, Batut S, Fittschen C, Taatjes CA, Osborn DL, Loison JC. Synchrotron-based double imaging photoelectron/photoion coincidence spectroscopy of radicals produced in a flow tube: OH and OD. J Chem Phys 2015; 142:164201. [DOI: 10.1063/1.4918634] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Xiaofeng Tang
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Jean-François Gil
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers, St. Aubin, BP 48, 91192 Gif sur Yvette, France
| | - Michael Ward
- PC2A, Université de Lille 1, UMR CNRS-USTL 8522, Cité Scientifique Bât. C11, F-59655 Villeneuve d’Ascq, France
| | - Sebastien Batut
- PC2A, Université de Lille 1, UMR CNRS-USTL 8522, Cité Scientifique Bât. C11, F-59655 Villeneuve d’Ascq, France
| | - Christa Fittschen
- PC2A, Université de Lille 1, UMR CNRS-USTL 8522, Cité Scientifique Bât. C11, F-59655 Villeneuve d’Ascq, France
| | - Craig A. Taatjes
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, USA
| | - David L. Osborn
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969, USA
| | - Jean-Christophe Loison
- ISM, Université Bordeaux 1, CNRS, 351 cours de la Libération, 33405 Talence Cedex, France
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81
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Hochlaf M, Pan Y, Lau KC, Majdi Y, Poisson L, Garcia GA, Nahon L, Al Mogren MM, Schwell M. Vibrationally resolved photoelectron spectroscopy of electronic excited states of DNA bases: application to the ã state of thymine cation. J Phys Chem A 2015; 119:1146-53. [PMID: 25611856 DOI: 10.1021/acs.jpca.5b00466] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
For fully understanding the light-molecule interaction dynamics at short time scales, recent theoretical and experimental studies proved the importance of accurate characterizations not only of the ground (D0) but also of the electronic excited states (e.g., D1) of molecules. While ground state investigations are currently straightforward, those of electronic excited states are not. Here, we characterized the à electronic state of ionic thymine (T(+)) DNA base using explicitly correlated coupled cluster ab initio methods and state-of-the-art synchrotron-based electron/ion coincidence techniques. The experimental spectrum is composed of rich and long vibrational progressions corresponding to the population of the low frequency modes of T(+)(Ã). This work challenges previous numerous works carried out on DNA bases using common synchrotron and VUV-based photoelectron spectroscopies. We provide hence a powerful theoretical and experimental framework to study the electronic structure of ionized DNA bases that could be generalized to other medium-sized biologically relevant systems.
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Affiliation(s)
- Majdi Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est , 5 bd Descartes, 77454 Marne-la-Vallée, France
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82
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Majdi Y, Hochlaf M, Pan Y, Lau KC, Poisson L, Garcia GA, Nahon L, Al-Mogren MM, Schwell M. Theoretical and Experimental Photoelectron Spectroscopy Characterization of the Ground State of Thymine Cation. J Phys Chem A 2015; 119:5951-8. [DOI: 10.1021/jp510716c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Youssef Majdi
- Laboratoire de Spectroscopie Atomique,
Moléculaire et Applications (LSAMA), Université de Tunis El Manar, Tunis, Tunisia
| | - Majdi Hochlaf
- Laboratoire
Modélisation et Simulation
Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - Yi Pan
- Department of Biology and
Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Kai-Chung Lau
- Department of Biology and
Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Lionel Poisson
- Laboratoire Francis
Perrin, CNRS URA 2453, CEA, IRAMIS, Laboratoire
Interactions
Dynamique et Lasers, Bât 522, F-91191 Gif/Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’orme des Merisiers, Saint-Aubin, BP 48 91192 Gif-sur-Yvette Cedex France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’orme des Merisiers, Saint-Aubin, BP 48 91192 Gif-sur-Yvette Cedex France
| | - Muneerah Mogren Al-Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - Martin Schwell
- Laboratoire Interuniversitaire
des Systèmes
Atmosphériques (LISA), UMR 7583 CNRS, Universités Paris-Est Créteil et Paris Diderot, Institut Pierre et Simon Laplace, 61 Avenue du
Général de Gaulle, 94010 Créteil, France
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83
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Tang X, Garcia GA, Nahon L. CH3+ Formation in the Dissociation of Energy-Selected CH3F+ Studied by Double Imaging Electron/Ion Coincidences. J Phys Chem A 2015; 119:5942-50. [DOI: 10.1021/jp510319b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Xiaofeng Tang
- Synchrotron SOLEIL, L’Orme
des Merisiers, St.
Aubin BP 48, 91192 Gif sur Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme
des Merisiers, St.
Aubin BP 48, 91192 Gif sur Yvette, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme
des Merisiers, St.
Aubin BP 48, 91192 Gif sur Yvette, France
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84
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Tang X, Garcia GA, Nahon L. Adiabatic ionization energies of the overlapped A2A1 and B2E electronic states in CH3Cl+/CH3F+ measured with double imaging electron/ion coincidence. Phys Chem Chem Phys 2015; 17:16858-63. [DOI: 10.1039/c5cp02105g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The overlapped A2A1 and B2E electronic states of CH3Cl+ have been separated and their adiabatic ionization energies have been measured from an electron and ion kinetic energy correlation diagram based on their different dissociation dynamics.
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Affiliation(s)
- Xiaofeng Tang
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
| | | | - Laurent Nahon
- Synchrotron SOLEIL
- L'Orme des Merisiers
- 91192 Gif sur Yvette
- France
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85
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Dossmann H, Schwarzenberg A, Lesage D, Pérot-Taillandier M, Afonso C, Cunha de Miranda B, Garcia GA. Vacuum Ultraviolet Photoionization Study of Gas Phase Vitamins A and B1 Using Aerosol Thermodesorption and Synchrotron Radiation. J Phys Chem A 2014; 118:11185-92. [DOI: 10.1021/jp507050y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Héloïse Dossmann
- Université Pierre et Marie Curie, IPCM/CSOB UMR 8232, 4, Place Jussieu BP 45, 75252 Paris, France
| | - Adrián Schwarzenberg
- Université Pierre et Marie Curie, IPCM/CSOB UMR 8232, 4, Place Jussieu BP 45, 75252 Paris, France
| | - Denis Lesage
- Université Pierre et Marie Curie, IPCM/CSOB UMR 8232, 4, Place Jussieu BP 45, 75252 Paris, France
| | - Marie Pérot-Taillandier
- Université Pierre et Marie Curie, IPCM/CSOB UMR 8232, 4, Place Jussieu BP 45, 75252 Paris, France
| | - Carlos Afonso
- Normandie Université, COBRA, UMR6014 and FR3038, Université de Rouen; INSA de Rouen; CNRS, IRCOF, 76821 Mont-Saint-Aignan
Cedex, France
| | | | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, St Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
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86
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Bréchignac P, Garcia GA, Falvo C, Joblin C, Kokkin D, Bonnamy A, Parneix P, Pino T, Pirali O, Mulas G, Nahon L. Photoionization of cold gas phase coronene and its clusters: Autoionization resonances in monomer, dimer, and trimer and electronic structure of monomer cation. J Chem Phys 2014; 141:164325. [DOI: 10.1063/1.4900427] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Philippe Bréchignac
- Institut des Sciences Moléculaires d’Orsay, CNRS UMR8214, Univ Paris-Sud, F-91405 Orsay, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, B.P. 48, F-91192 Gif-sur-Yvette, France
| | - Cyril Falvo
- Institut des Sciences Moléculaires d’Orsay, CNRS UMR8214, Univ Paris-Sud, F-91405 Orsay, France
| | - Christine Joblin
- IRAP, Université de Toulouse 3 - CNRS, 9 Av. Colonel Roche, B.P. 44346, F-31028 Toulouse Cedex 4, France
| | - Damian Kokkin
- IRAP, Université de Toulouse 3 - CNRS, 9 Av. Colonel Roche, B.P. 44346, F-31028 Toulouse Cedex 4, France
| | - Anthony Bonnamy
- IRAP, Université de Toulouse 3 - CNRS, 9 Av. Colonel Roche, B.P. 44346, F-31028 Toulouse Cedex 4, France
| | - Pascal Parneix
- Institut des Sciences Moléculaires d’Orsay, CNRS UMR8214, Univ Paris-Sud, F-91405 Orsay, France
| | - Thomas Pino
- Institut des Sciences Moléculaires d’Orsay, CNRS UMR8214, Univ Paris-Sud, F-91405 Orsay, France
| | - Olivier Pirali
- Institut des Sciences Moléculaires d’Orsay, CNRS UMR8214, Univ Paris-Sud, F-91405 Orsay, France
| | - Giacomo Mulas
- INAF - Osservatorio Astronomico di Cagliari, via della scienza 5, I-09047 Selargius (CA), Italy
| | - Laurent Nahon
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, B.P. 48, F-91192 Gif-sur-Yvette, France
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87
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Garcia GA, Dossmann H, Nahon L, Daly S, Powis I. Photoelectron circular dichroism and spectroscopy of trifluoromethyl- and methyl-oxirane: a comparative study. Phys Chem Chem Phys 2014; 16:16214-24. [DOI: 10.1039/c4cp01941e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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88
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Leach S, Garcia GA, Mahjoub A, Bénilan Y, Fray N, Gazeau MC, Gaie-Levrel F, Champion N, Schwell M. Ionization photophysics and spectroscopy of cyanoacetylene. J Chem Phys 2014; 140:174305. [PMID: 24811639 DOI: 10.1063/1.4871298] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photoionization of cyanoacetylene was studied using synchrotron radiation over the non-dissociative ionization excitation range 11-15.6 eV, with photoelectron-photoion coincidence techniques. The absolute ionization cross-section and spectroscopic aspects of the parent ion were recorded. The adiabatic ionization energy of cyanoacetylene was measured as 11.573 ± 0.010 eV. A detailed analysis of photoelectron spectra of HC3N involves new aspects and new assignments of the vibrational components to excitation of the A(2)Σ(+) and B(2)Π states of the cation. Some of the structured autoionization features observed in the 11.94 to 15.5 eV region of the total ion yield (TIY) spectrum were assigned to two Rydberg series converging to the B(2)Π state of HC3N(+). A number of the measured TIY features are suggested to be vibrational components of Rydberg series converging to the C(2)Σ(+) state of HC3N(+) at ≈17.6 eV and others to valence shell transitions of cyanoacetylene in the 11.6-15 eV region. The results of quantum chemical calculations of the cation electronic state geometries, vibrational frequencies and energies, as well as of the C-H dissociation potential energy profiles of the ground and electronic excited states of the ion, are compared with experimental observations. Ionization quantum yields are evaluated and discussed and the problem of adequate calibration of photoionization cross-sections is raised.
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Affiliation(s)
- Sydney Leach
- LERMA UMR CNRS 8112, Observatoire de Paris-Meudon, 5 place Jules-Jansen, 92195 Meudon, France
| | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192, Gif-sur-Yvette Cedex, France
| | - Ahmed Mahjoub
- LISA UMR CNRS 7583, Université Paris Est Créteil and Université Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - Yves Bénilan
- LISA UMR CNRS 7583, Université Paris Est Créteil and Université Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - Nicolas Fray
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192, Gif-sur-Yvette Cedex, France
| | - Marie-Claire Gazeau
- LISA UMR CNRS 7583, Université Paris Est Créteil and Université Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010 Créteil, France
| | - François Gaie-Levrel
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192, Gif-sur-Yvette Cedex, France
| | - Norbert Champion
- LERMA UMR CNRS 8112, Observatoire de Paris-Meudon, 5 place Jules-Jansen, 92195 Meudon, France
| | - Martin Schwell
- LISA UMR CNRS 7583, Université Paris Est Créteil and Université Paris Diderot, Institut Pierre Simon Laplace, 61 Avenue du Général de Gaulle, 94010 Créteil, France
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89
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Tia M, Cunha de Miranda B, Daly S, Gaie-Levrel F, Garcia GA, Nahon L, Powis I. VUV photodynamics and chiral asymmetry in the photoionization of gas phase alanine enantiomers. J Phys Chem A 2014; 118:2765-79. [PMID: 24654892 DOI: 10.1021/jp5016142] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The valence shell photoionization of the simplest proteinaceous chiral amino acid, alanine, is investigated over the vacuum ultraviolet region from its ionization threshold up to 18 eV. Tunable and variable polarization synchrotron radiation was coupled to a double imaging photoelectron/photoion coincidence (i(2)PEPICO) spectrometer to produce mass-selected threshold photoelectron spectra and derive the state-selected fragmentation channels. The photoelectron circular dichroism (PECD), an orbital-sensitive, conformer-dependent chiroptical effect, was also recorded at various photon energies and compared to continuum multiple scattering calculations. Two complementary vaporization methods-aerosol thermodesorption and a resistively heated sample oven coupled to an adiabatic expansion-were applied to promote pure enantiomers of alanine into the gas phase, yielding neutral alanine with different internal energy distributions. A comparison of the photoelectron spectroscopy, fragmentation, and dichroism measured for each of the vaporization methods was rationalized in terms of internal energy and conformer populations and supported by theoretical calculations. The analytical potential of the so-called PECD-PICO detection technique-where the electron spectroscopy and circular dichroism can be obtained as a function of mass and ion translational energy-is underlined and applied to characterize the origin of the various species found in the experimental mass spectra. Finally, the PECD findings are discussed within an astrochemical context, and possible implications regarding the origin of biomolecular asymmetry are identified.
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Affiliation(s)
- Maurice Tia
- Synchrotron SOLEIL, l'Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
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90
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Powis I, Daly S, Tia M, de Miranda BC, Garcia GA, Nahon L. A photoionization investigation of small, homochiral clusters of glycidol using circularly polarized radiation and velocity map electron–ion coincidence imaging. Phys Chem Chem Phys 2014; 16:467-76. [PMID: 24077129 DOI: 10.1039/c3cp53248h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Ivan Powis
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
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91
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O'Keeffe P, Gryzlova EV, Cubaynes D, Garcia GA, Nahon L, Grum-Grzhimailo AN, Meyer M. Isotopically resolved photoelectron imaging unravels complex atomic autoionization dynamics by two-color resonant ionization. Phys Rev Lett 2013; 111:243002. [PMID: 24483651 DOI: 10.1103/physrevlett.111.243002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Indexed: 06/03/2023]
Abstract
Angle-resolved electron spectroscopy in coincidence with high-resolution mass spectroscopy has been applied to study two-color resonant photoionization in atomic xenon. Separation of different isotopes enabled us to extract results for the electronic dynamics free from depolarization effects, which are generally introduced by the coupling of the electronic and nuclear angular momenta. The concerted experimental and theoretical analysis of the photoelectron angular distributions in the region of an autoionizing resonance emphasizes the strong sensitivity of the observed structures to the fine details of the treatment of the underlying dynamics.
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Affiliation(s)
- P O'Keeffe
- CNR Istituto di Metodologie Inorganiche e dei Plasmi, CP10, I-00016 Monterotondo Scalo, Italy
| | - E V Gryzlova
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - D Cubaynes
- ISMO, CNRS/Université Paris-Sud, Bâtiment 350, F-91405 Orsay Cedex, France
| | - G A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif sur Yvette, France
| | - L Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, B.P. 48, 91192 Gif sur Yvette, France
| | - A N Grum-Grzhimailo
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia
| | - M Meyer
- European XFEL GmbH, Albert-Einstein-Ring 19, D-22761 Hamburg, Germany
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92
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Leach S, Schwell M, Garcia GA, Bénilan Y, Fray N, Gazeau MC, Gaie-Levrel F, Champion N, Guillemin JC. Ionization photophysics and spectroscopy of dicyanoacetylene. J Chem Phys 2013; 139:184304. [PMID: 24320271 DOI: 10.1063/1.4826467] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Photoionization of dicyanoacetylene was studied using synchrotron radiation over the excitation range 8-25 eV, with photoelectron-photoion coincidence techniques. The absolute ionization cross-section and detailed spectroscopic aspects of the parent ion were recorded. The adiabatic ionization energy of dicyanoacetylene was measured as 11.80 ± 0.01 eV. A detailed analysis of the cation spectroscopy involves new aspects and new assignments of the vibrational components to excitation of the quasi-degenerate A(2)Πg, B(2)Σg(+) states as well as the C(2)Σu(+) and D(2)Πu states of the cation. Some of the structured autoionization features observed in the 12.4-15 eV region of the total ion yield spectrum were assigned to vibrational components of valence shell transitions and to two previously unknown Rydberg series converging to the D(2)Πu state of C4N2(+). The appearance energies of the fragment ions C4N(+), C3N(+), C4(+), C2N(+), and C2(+) were measured and their heats of formation were determined and compared with existing literature values. Thermochemical calculations of the appearance potentials of these and other weaker ions were used to infer aspects of dissociative ionization pathways.
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Affiliation(s)
- Sydney Leach
- LERMA UMR CNRS 8112, Observatoire de Paris-Meudon, 5 place Jules-Jansen, 92195 Meudon, France
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93
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Garcia GA, Cunha de Miranda BK, Tia M, Daly S, Nahon L. DELICIOUS III: a multipurpose double imaging particle coincidence spectrometer for gas phase vacuum ultraviolet photodynamics studies. Rev Sci Instrum 2013; 84:053112. [PMID: 23742537 DOI: 10.1063/1.4807751] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present a versatile double imaging particle coincidence spectrometer operating in fully continuous mode, named DELICIOUS III, which combines a velocity map imaging device and a modified Wiley-McLaren time of flight momentum imaging analyzer for photoelectrons and photoions, respectively. The spectrometer is installed in a permanent endstation on the DESIRS vacuum ultraviolet (VUV) beamline at the French National Synchrotron Radiation Facility SOLEIL, and is dedicated to gas phase VUV spectroscopy, photoionization, and molecular dynamics studies. DELICIOUS III is capable of recording mass-selected threshold photoelectron photoion coincidence spectra with a sub-meV resolution, and the addition of a magnifying lens inside the electron drift tube provides a sizeable improvement of the electron threshold/ion mass resolution compromise. In fast electron mode the ultimate kinetic energy resolution has been measured at ΔE/E = 4%. The ion spectrometer offers a mass resolution--full separation of adjacent masses--of 250 amu for moderate extraction fields and the addition of an electrostatic lens in the second acceleration region allows measuring the full 3D velocity vector for a given mass with an ultimate energy resolution of ΔE/E = 15%, without sacrificing the mass resolution. Hence, photoelectron images are correlated both to the mass and to the ion kinetic energy and recoil direction, to access the electron spectroscopy of size-selected species, to study the photodissociation processes of state-selected cations in detail, or to measure in certain cases photoelectron angular distributions in the ion recoil frame. The performances of DELICIOUS III are explored through several examples including the photoionization of N2, NO, and CF3.
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Affiliation(s)
- G A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette, France.
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94
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Nahon L, Oliveira ND, Garcia GA, Gil JF, Joyeux D, Lagarde B, Polack F. DESIRS : a state-of-the-art VUV beamline featuring high resolution and variable polarization for spectroscopy and dichroism at SOLEIL. ACTA ACUST UNITED AC 2013. [DOI: 10.1088/1742-6596/425/12/122004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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95
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Affiliation(s)
- Yi Pan
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Kai-Chung Lau
- Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Lionel Poisson
- CNRS, IRAMIS,
SPAM, Laboratoire Francis Perrin, URA 2453, F-91191 Gif-sur-Yvette, France
- CEA, IRAMIS, SPAM, Laboratoire Francis Perrin, URA 2453, F-91191 Gif-sur-Yvette, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’orme
des Merisiers, Saint-Aubin - BP 48 - 91192 Gif-sur-Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, L’orme
des Merisiers, Saint-Aubin - BP 48 - 91192 Gif-sur-Yvette Cedex, France
| | - Majdi Hochlaf
- Laboratoire Modélisation
et Simulation Multi
Echelle, Université Paris-Est, MSME
UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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96
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Garcia GA, Nahon L, Daly S, Powis I. Vibrationally induced inversion of photoelectron forward-backward asymmetry in chiral molecule photoionization by circularly polarized light. Nat Commun 2013; 4:2132. [PMID: 23828557 PMCID: PMC3715848 DOI: 10.1038/ncomms3132] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 06/07/2013] [Indexed: 11/08/2022] Open
Abstract
Electron-nuclei coupling accompanying excitation and relaxation processes is a fascinating phenomenon in molecular dynamics. A striking and unexpected example of such coupling is presented here in the context of photoelectron circular dichroism measurements on randomly oriented, chiral methyloxirane molecules, unaffected by any continuum resonance. Here, we report that the forward-backward asymmetry in the electron angular distribution, with respect to the photon axis, which is associated with photoelectron circular dichroism can surprisingly reverse direction according to the ion vibrational mode excited. This vibrational dependence represents a clear breakdown of the usual Franck-Condon assumption, ascribed to the enhanced sensitivity of photoelectron circular dichroism (compared with other observables like cross-sections or the conventional anisotropy parameter-β) to the scattering phase off the chiral molecular potential, inducing a dependence on the nuclear geometry sampled in the photoionization process. Important consequences for the interpretation of such dichroism measurements within analytical contexts are discussed.
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Affiliation(s)
- Gustavo A. Garcia
- Synchrotron SOLEIL, l′Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
| | - Laurent Nahon
- Synchrotron SOLEIL, l′Orme des Merisiers, Saint Aubin BP 48, 91192 Gif sur Yvette Cedex, France
| | - Steven Daly
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK
| | - Ivan Powis
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK
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Mahjoub A, Hochlaf M, Garcia GA, Nahon L, Poisson L. State-selected unimolecular decomposition of δ-valerolactam+ and δ-valerolactam2+ cations: theory and experiment. J Phys Chem A 2012; 116:8706-12. [PMID: 22881603 DOI: 10.1021/jp3056976] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The near threshold photofragmentation pattern of δ-valerolactam(+) and δ-valerolactam(2)(+) has been recorded combining electron/ion coincidence techniques and vacuum ultraviolet synchrotron radiation. The experimental method yields the fragment intensity as a function of the internal energy deposited into the parent cation, up to 3.1 eV above the first ionization threshold. In parallel, ab initio studies on the δ-valerolactam(+) and δ-valerolactam(2)(+) cations and their ionic and neutral fragmentation products have been performed with the aim of determining the isomers of the ionic products observed experimentally as well as of their neutral counterparts. These computations were performed using the PBE0 exchange-correlation functional and the aug-cc-pVDZ basis set. We found good agreement between the calculated reaction enthalpies and experimental appearance energies of the ions. More generally, our experimental and theoretical results reveal that the fragmentation of the ionic species of interest leads to a multitude of neutral and ionic fragments, which may be formed after intramolecular isomerization and complex decomposition processes. Multistep reaction pathways are expected.
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Affiliation(s)
- A Mahjoub
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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98
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Nahon L, de Oliveira N, Garcia GA, Gil JF, Pilette B, Marcouillé O, Lagarde B, Polack F. DESIRS: a state-of-the-art VUV beamline featuring high resolution and variable polarization for spectroscopy and dichroism at SOLEIL. J Synchrotron Radiat 2012; 19:508-20. [PMID: 22713882 DOI: 10.1107/s0909049512010588] [Citation(s) in RCA: 193] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Accepted: 03/09/2012] [Indexed: 05/26/2023]
Abstract
DESIRS is a new undulator-based VUV beamline on the 2.75 GeV storage ring SOLEIL (France) optimized for gas-phase studies of molecular and electronic structures, reactivity and polarization-dependent photodynamics on model or actual systems encountered in the universe, atmosphere and biosphere. It is equipped with two dedicated endstations: a VUV Fourier-transform spectrometer (FTS) for ultra-high-resolution absorption spectroscopy (resolving power up to 10(6)) and an electron/ion imaging coincidence spectrometer. The photon characteristics necessary to fulfill its scientific mission are: high flux in the 5-40 eV range, high spectral purity, high resolution, and variable and well calibrated polarizations. The photon source is a 10 m-long pure electromagnetic variable-polarization undulator producing light from the very near UV up to 40 eV on the fundamental emission with tailored elliptical polarization allowing fully calibrated quasi-perfect horizontal, vertical and circular polarizations, as measured with an in situ VUV polarimeter with absolute polarization rates close to unity, to be obtained at the sample location. The optical design includes a beam waist allowing the implementation of a gas filter to suppress the undulator high harmonics. This harmonic-free radiation can be steered toward the FTS for absorption experiments, or go through a highly efficient pre-focusing optical system, based on a toroidal mirror and a reflective corrector plate similar to a Schmidt plate. The synchrotron radiation then enters a 6.65 m Eagle off-plane normal-incidence monochromator equipped with four gratings with different groove densities, from 200 to 4300 lines mm(-1), allowing the flux-to-resolution trade-off to be smoothly adjusted. The measured ultimate instrumental resolving powers are 124000 (174 µeV) around 21 eV and 250000 (54 µeV) around 13 eV, while the typical measured flux is in the 10(10)-10(11) photons s(-1) range in a 1/50000 bandwidth, and 10(12)-10(13) photons s(-1) in a 1/1000 bandwidth, which is very satisfactory although slightly below optical simulations. All of these features make DESIRS a state-of-the-art VUV beamline for spectroscopy and dichroism open to a broad scientific community.
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Affiliation(s)
- Laurent Nahon
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, BP 48, 91192 Gif sur Yvette Cedex, France.
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Dossmann (Soldi-Lose) H, Garcia GA, Nahon L, de Miranda BKC, Alcaraz C. Comprehensive vacuum ultraviolet photoionization study of the CF3• trifluoromethyl radical using synchrotron radiation. J Chem Phys 2012; 136:204304. [DOI: 10.1063/1.4719529] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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100
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Schwell M, Bénilan Y, Fray N, Gazeau MC, Es-Sebbar E, Garcia GA, Nahon L, Champion N, Leach S. VUV photoionization of acetamide studied by electron/ion coincidence spectroscopy in the 8–24 eV photon energy range. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.11.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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