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Mazo-Sevillano PD, Aguado A, Goicoechea JR, Roncero O. Quantum study of the CH3+ photodissociation in full-dimensional neural network potential energy surfaces. J Chem Phys 2024; 160:184307. [PMID: 38738612 DOI: 10.1063/5.0206895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 04/22/2024] [Indexed: 05/14/2024] Open
Abstract
C H 3 + , a cornerstone intermediate in interstellar chemistry, has recently been detected for the first time by using the James Webb Space Telescope. The photodissociation of this ion is studied here. Accurate explicitly correlated multi-reference configuration interaction ab initio calculations are done, and full-dimensional potential energy surfaces are developed for the three lower electronic states, with a fundamental invariant neural network method. The photodissociation cross section is calculated using a full-dimensional quantum wave packet method in heliocentric Radau coordinates. The wave packet is represented in angular and radial grids, allowing us to reduce the number of points physically accessible, requiring to push up the spurious states appearing when evaluating the angular kinetic terms, through projection technique. The photodissociation spectra, when employed in astrochemical models to simulate the conditions of the Orion bar, result in a lesser destruction of CH3+ compared to that obtained when utilizing the recommended values in the kinetic database for astrochemistry.
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Affiliation(s)
- Pablo Del Mazo-Sevillano
- Unidad Asociada UAM-IFF-CSIC, Departamento de Química Física Aplicada, Facultad de Ciencias M-14, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Alfredo Aguado
- Unidad Asociada UAM-IFF-CSIC, Departamento de Química Física Aplicada, Facultad de Ciencias M-14, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Javier R Goicoechea
- Instituto de Física Fundamental (IFF-CSIC), C.S.I.C., Serrano 123, 28006 Madrid, Spain
| | - Octavio Roncero
- Instituto de Física Fundamental (IFF-CSIC), C.S.I.C., Serrano 123, 28006 Madrid, Spain
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2
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Pan Z, Bodi A, van Bokhoven JA, Hemberger P. On the absolute photoionization cross section and threshold photoelectron spectrum of two reactive ketenes in lignin valorization: fulvenone and 2-carbonyl cyclohexadienone. Phys Chem Chem Phys 2022; 24:3655-3663. [PMID: 35080222 PMCID: PMC8827046 DOI: 10.1039/d1cp05206c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We report the absolute photoionization cross section (PICS) of fulvenone and 2-carbonyl cyclohexadienone, two crucial ketene intermediates in lignin pyrolysis, combustion and organic synthesis. Both species were generated in situ by pyrolyzing salicylamide and dectected via imaging photoelectron photoion coincidence spectroscopy. In a deamination reaction, salicylamide loses ammonia yielding 2-carbonyl cyclohexadienone, a ketoketene, which further decarbonylates at higher pyrolysis temperatures to form fulvenone. We recorded the threshold photoelectron spectrum of the ketoketene and assigned the ground state (X̃+2A′′ ← X̃1A′) and excited state (Ã+2A′ ← X̃1A′) bands with the help of Franck–Condon simulations. Adiabatic ionization energies are 8.35 ± 0.01 and 9.19 ± 0.01 eV. In a minor reaction channel, the ketoketene isomerizes to benzpropiolactone, which decomposes subsequently to benzyne by CO2 loss. Potential energy surface and RRKM rate constant calculations agree with our experimental observations that the decarbonylation to fulvenone outcompetes the decarboxylation to benzyne by almost two orders of magnitude. The absolute PICS of fulvenone at 10.48 eV was determined to be 18.8 ± 3.8 Mb using NH3 as a calibrant. The PICS of 2-carbonyl cyclohexadienone was found to be 21.5 ± 8.6 Mb at 9 eV. Our PICS measument will enable the quantification of reactive ketenes in lignin valorization and combustion processes using photoionization techniques and provide advanced mechanistic and kinetics insights to aid the bottom-up optimization of such processes. The absolute photoionization cross section (PICS) of these crucial ketene intermediates supports their quantification in lignin pyrolysis, combustion and organic synthesis.![]()
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Affiliation(s)
- Zeyou Pan
- Zeyou Pan, Andras Bodi, Jeroen A. van Bokhoven and Patrick Hemberger, Paul Scherrer Institute, 5232 Villigen, Switzerland. .,Zeyou Pan and Jeroen A. van Bokhoven, Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Andras Bodi
- Zeyou Pan, Andras Bodi, Jeroen A. van Bokhoven and Patrick Hemberger, Paul Scherrer Institute, 5232 Villigen, Switzerland.
| | - Jeroen A van Bokhoven
- Zeyou Pan, Andras Bodi, Jeroen A. van Bokhoven and Patrick Hemberger, Paul Scherrer Institute, 5232 Villigen, Switzerland. .,Zeyou Pan and Jeroen A. van Bokhoven, Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Patrick Hemberger
- Zeyou Pan, Andras Bodi, Jeroen A. van Bokhoven and Patrick Hemberger, Paul Scherrer Institute, 5232 Villigen, Switzerland.
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3
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Jin H, Yang J, Farooq A. Determination of absolute photoionization cross-sections of some aromatic hydrocarbons. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8899. [PMID: 32677075 DOI: 10.1002/rcm.8899] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 07/14/2020] [Accepted: 07/14/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE Aromatic hydrocarbons play an important role in the formation and growth of polycyclic aromatic hydrocarbon (PAH) and soot particles. Measurements of their absolute photoionization cross-sections (PICSs), that benefit the quantitative investigation of mass spectrometry, are still lacking, however. METHODS PICSs of some aromatic hydrocarbons were measured with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Nitric oxide and benzene were chosen as standard references for PICS calibration, since their photoionization cross-sections are well documented in the literature. Binary liquid mixtures of the investigated molecules and their specific solvents were used in the measurements. RESULTS The investigated aromatics include naphthalene, phenanthrene, 1-methylnaphthalene, indene, 2-/3-/4-methylphenylacetylene, 2-methylindene, diphenylacetylene, 1-/2-ethynylnaphthalene and acenaphthylene. Photo-induced fragments from the molecules were also observed with increasing photon energy. CONCLUSIONS Based on our measurements and literature data, PICSs of most aromatic molecules have very similar values beyond their ionization energies. However, molecules that contain the phenylacetylene structure have PICSs higher than other aromatics.
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Affiliation(s)
- Hanfeng Jin
- Physical Sciences and Engineering Division, Clean Combustion Research Centre, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Jiuzhong Yang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China
| | - Aamir Farooq
- Physical Sciences and Engineering Division, Clean Combustion Research Centre, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
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4
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Hartweg S, Loison JC, Boyé-Péronne S, Gans B, Holland DMP, Garcia GA, Nahon L, Pratt ST. Photoionization of C 4H 5 Isomers. J Phys Chem A 2020; 124:6050-6060. [PMID: 32551647 DOI: 10.1021/acs.jpca.0c03317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Single-photon, photoelectron-photoion coincidence spectroscopy is used to record the mass-selected ion spectra and slow photoelectron spectra of C4H5 radicals produced by the abstraction of hydrogen atoms from three C4H6 precursors by fluorine atoms generated by a microwave discharge. Three different C4H5 isomers are identified, with the relative abundances depending on the nature of the precursor (1-butyne, 1,2-butadiene, and 1,3-butadiene). The results are compared with our previous work using 2-butyne as a precursor [Hrodmarsson, H. R. J. Phys. Chem. A 2019, 123, 1521-1528]. The slow photoelectron spectra provide new information on the three radical isomers that is in good agreement with previous experimental and theoretical results [Lang, M. J. Phys. Chem. A 2015, 119, 3995-4000; Hansen, N. J. Phys. Chem. A 2006, 110, 3670-3678]. The energy scans of the C4H5 photoionization signal are recorded with substantially better resolution and signal-to-noise ratio than those in earlier work, allowing the observation of autoionizing resonances based on excited states of the C4H5 cation. Photoelectron images recorded at several energies are also reported, providing insight into the decay processes of these excited states. Finally, in contrast to the earlier work using 2-butyne as a precursor, where H-atom abstraction was the only observed process, F- and H-atom additions to the present precursors are also observed through the detection of C4H6F, C4H5F, and C4H7.
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Affiliation(s)
- S Hartweg
- Synchrotron Soleil, L'Orme des Merisiers, Gif-sur-Yvette F-91192, France
| | - J-C Loison
- Institut des Sciences Moléculaires (ISM), CNRS, Univ. Bordeaux, 351 cours de la Libération, Talence 33400, France
| | - S Boyé-Péronne
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, Orsay F-91405, France
| | - B Gans
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, Orsay F-91405, France
| | - D M P Holland
- STFC, Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, U.K
| | - G A Garcia
- Synchrotron Soleil, L'Orme des Merisiers, Gif-sur-Yvette F-91192, France
| | - L Nahon
- Synchrotron Soleil, L'Orme des Merisiers, Gif-sur-Yvette F-91192, France
| | - S T Pratt
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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5
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Hrodmarsson HR, Loison JC, Jacovella U, Holland DMP, Boyé-Péronne S, Gans B, Garcia GA, Nahon L, Pratt ST. Valence-Shell Photoionization of C4H5: The 2-Butyn-1-yl Radical. J Phys Chem A 2019; 123:1521-1528. [DOI: 10.1021/acs.jpca.8b11809] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. R. Hrodmarsson
- Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - J.-C. Loison
- Institut des Sciences Moléculaires, Université Bordeaux, 33400 Talence, France
| | - U. Jacovella
- Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - D. M. P. Holland
- STFC, Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, United Kingdom
| | - S. Boyé-Péronne
- Institut des Sciences Moléculaires d’Orsay, UMR 8214, CNRS & Univ. Paris-Sud & Université Paris-Saclay, F-91405 Orsay, France
| | - B. Gans
- Institut des Sciences Moléculaires d’Orsay, UMR 8214, CNRS & Univ. Paris-Sud & Université Paris-Saclay, F-91405 Orsay, France
| | - G. A. Garcia
- Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - L. Nahon
- Synchrotron Soleil, L’Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - S. T. Pratt
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439 United States
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6
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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] [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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7
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Agúndez M, Roueff E, Le Petit F, Le Bourlot J. The chemistry of disks around T Tauri and Herbig Ae/Be stars. ASTRONOMY AND ASTROPHYSICS 2018; 616:A19. [PMID: 30185991 PMCID: PMC6120683 DOI: 10.1051/0004-6361/201732518] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
CONTEXT Infrared and (sub-)mm observations of disks around T Tauri and Herbig Ae/Be stars point to a chemical differentiation between both types of disks, with a lower detection rate of molecules in disks around hotter stars. AIMS To investigate the underlying causes of the chemical differentiation indicated by observations we perform a comparative study of the chemistry of T Tauri and Herbig Ae/Be disks. This is one of the first studies to compare chemistry in the outer regions of these two types of disks. METHODS We developed a model to compute the chemical composition of a generic protoplanetary disk, with particular attention to the photochemistry, and applied it to a T Tauri and a Herbig Ae/Be disk. We compiled cross sections and computed photodissociation and photoionization rates at each location in the disk by solving the FUV radiative transfer in a 1+1D approach using the Meudon PDR code and adopting observed stellar spectra. RESULTS The warmer disk temperatures and higher ultraviolet flux of Herbig stars compared to T Tauri stars induce some differences in the disk chemistry. In the hot inner regions, H2O, and simple organic molecules like C2H2, HCN, and CH4 are predicted to be very abundant in T Tauri disks and even more in Herbig Ae/Be disks, in contrast with infrared observations that find a much lower detection rate of water and simple organics toward disks around hotter stars. In the outer regions, the model indicates that the molecules typically observed in disks, like HCN, CN, C2H, H2CO, CS, SO, and HCO+, do not have drastic abundance differences between T Tauri and Herbig Ae disks. Some species produced under the action of photochemistry, like C2H and CN, are predicted to have slightly lower abundances around Herbig Ae stars due to a narrowing of the photochemically active layer. Observations indeed suggest that these radicals are somewhat less abundant in Herbig Ae disks, although in any case the inferred abundance differences are small, of a factor of a few at most. A clear chemical differentiation between both types of disks concerns ices. Owing to the warmer temperatures of Herbig Ae disks, one expects snowlines lying farther away from the star and a lower mass of ices compared to T Tauri disks. CONCLUSIONS The global chemical behavior of T Tauri and Herbig Ae/Be disks is quite similar. The main differences are driven by the warmer temperatures of the latter, which result in a larger reservoir or water and simple organics in the inner regions and a lower mass of ices in the outer disk.
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Affiliation(s)
- Marcelino Agúndez
- Instituto de Física Fundamental, CSIC, C/ Serrano 123, E-28006 Madrid, Spain
| | - Evelyne Roueff
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-92190 Meudon, France
| | - Franck Le Petit
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-92190 Meudon, France
| | - Jacques Le Bourlot
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-92190 Meudon, France
- Université Paris-Diderot, Sorbonne Paris-Cité, F-75013 Paris, France
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8
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Holzmeier F, Fischer I, Kiendl B, Krueger A, Bodi A, Hemberger P. On the absolute photoionization cross section and dissociative photoionization of cyclopropenylidene. Phys Chem Chem Phys 2016; 18:9240-7. [DOI: 10.1039/c6cp01068g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the determination of the absolute photoionization cross section of cyclopropenylidene, c-C3H2, and the heat of formation of the C3H radical and ion derived by the dissociative ionization of the carbene.
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Affiliation(s)
- Fabian Holzmeier
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Benjamin Kiendl
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Anke Krueger
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Andras Bodi
- Paul Scherrer Institut
- CH-5232 Villigen PSI
- Switzerland
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9
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Savee JD, Borkar S, Welz O, Sztáray B, Taatjes CA, Osborn DL. Multiplexed Photoionization Mass Spectrometry Investigation of the O(3P) + Propyne Reaction. J Phys Chem A 2015; 119:7388-403. [DOI: 10.1021/acs.jpca.5b00491] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John D. Savee
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Sampada Borkar
- Department
of Chemistry, University of the Pacific, Stockton, California 95211, United States
| | - Oliver Welz
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Bálint Sztáray
- Department
of Chemistry, University of the Pacific, Stockton, California 95211, United States
| | - Craig A. Taatjes
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - David L. Osborn
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
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10
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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] [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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11
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Dodson LG, Shen L, Savee JD, Eddingsaas NC, Welz O, Taatjes CA, Osborn DL, Sander SP, Okumura M. VUV photoionization cross sections of HO2, H2O2, and H2CO. J Phys Chem A 2015; 119:1279-91. [PMID: 25621533 DOI: 10.1021/jp508942a] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The absolute vacuum ultraviolet (VUV) photoionization spectra of the hydroperoxyl radical (HO2), hydrogen peroxide (H2O2), and formaldehyde (H2CO) have been measured from their first ionization thresholds to 12.008 eV. HO2, H2O2, and H2CO were generated from the oxidation of methanol initiated by pulsed-laser-photolysis of Cl2 in a low-pressure slow flow reactor. Reactants, intermediates, and products were detected by time-resolved multiplexed synchrotron photoionization mass spectrometry. Absolute concentrations were obtained from the time-dependent photoion signals by modeling the kinetics of the methanol oxidation chemistry. Photoionization cross sections were determined at several photon energies relative to the cross section of methanol, which was in turn determined relative to that of propene. These measurements were used to place relative photoionization spectra of HO2, H2O2, and H2CO on an absolute scale, resulting in absolute photoionization spectra.
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Affiliation(s)
- Leah G Dodson
- Division of Chemistry and Chemical Engineering and §NASA Jet Propulsion Laboratory, California Institute of Technology , Pasadena, California 91125, United States
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12
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Velasco AM, Lavín C, Dolgounitcheva O, Ortiz JV. Excitation energies, photoionization cross sections, and asymmetry parameters of the methyl and silyl radicals. J Chem Phys 2014; 141:074308. [DOI: 10.1063/1.4892584] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Savee JD, Lockyear JF, Borkar S, Eskola AJ, Welz O, Taatjes CA, Osborn DL. Note: Absolute photoionization cross-section of the vinyl radical. J Chem Phys 2013; 139:056101. [DOI: 10.1063/1.4817320] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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14
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Xu H, Pratt ST. Photodissociation of Anisole and Absolute Photoionization Cross-Section of the Phenoxy Radical. J Phys Chem A 2013; 117:12075-81. [DOI: 10.1021/jp4047177] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hong Xu
- Argonne National Laboratory,
Argonne, Illinois 60439, United States
| | - S. T. Pratt
- Argonne National Laboratory,
Argonne, Illinois 60439, United States
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15
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Loison JC, Rayez MT, Rayez JC, Gratien A, Morajkar P, Fittschen C, Villenave E. Gas-Phase Reaction of Hydroxyl Radical with Hexamethylbenzene. J Phys Chem A 2012. [DOI: 10.1021/jp307568c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-Christophe Loison
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Marie-Thérèse Rayez
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Jean-Claude Rayez
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Aline Gratien
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Pranay Morajkar
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
- Universite Lille, PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
- CNRS,
PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
| | - Christa Fittschen
- Universite Lille, PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
- CNRS,
PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
| | - Eric Villenave
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
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16
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Xu H, Pratt ST. Photoionization Cross Section of the Propargyl Radical and Some General Ideas for Estimating Radical Cross Sections. J Phys Chem A 2012. [DOI: 10.1021/jp309874q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hong Xu
- Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - S. T. Pratt
- Argonne National Laboratory, Argonne, Illinois 60439, United States
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17
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Daranlot J, Hickson KM, Loison JC, Méreau R, Caralp F, Forst W, Bergeat A. Gas-phase kinetics of the hydroxyl radical reaction with allene: absolute rate measurements at low temperature, product determinations, and calculations. J Phys Chem A 2012; 116:10871-81. [PMID: 23126232 DOI: 10.1021/jp304831x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The gas phase reaction of the hydroxyl radical with allene has been studied theoretically and experimentally in a continuous supersonic flow reactor over the range 50 ≤ T/K ≤ 224. This reaction has been found to exhibit a negative temperature dependence over the entire temperature range investigated, varying between (0.75 and 5.0) × 10(-11) cm(3) molecule(-1) s(-1). Product formation from the reaction of OH and OD radicals with allene (C(3)H(4)) has been investigated in a fast flow reactor through time-of-flight mass spectrometry, at pressures between 0.8 and 2.4 Torr. The branching ratios for adduct formation (C(3)H(4)OH) in this pressure range are found to be equal to 34 ± 16% and 48 ± 16% for the OH and OD + allene reactions, respectively, the only other channel being the formation of CH(3) or CH(2)D + H(2)CCO (ketene). Moreover, the rate constant for the OD + C(3)H(4) reaction is also found to be 1.4 times faster than the rate constant for the OH + C(3)H(4) reaction at 1.5 Torr and at 298 K. The experimental results and implications for atmospheric chemistry have been rationalized by quantum chemical and RRKM calculations.
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Savee JD, Soorkia S, Welz O, Selby TM, Taatjes CA, Osborn DL. Absolute photoionization cross-section of the propargyl radical. J Chem Phys 2012; 136:134307. [PMID: 22482552 DOI: 10.1063/1.3698282] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using synchrotron-generated vacuum-ultraviolet radiation and multiplexed time-resolved photoionization mass spectrometry we have measured the absolute photoionization cross-section for the propargyl (C(3)H(3)) radical, σ(propargyl) (ion)(E), relative to the known absolute cross-section of the methyl (CH(3)) radical. We generated a stoichiometric 1:1 ratio of C(3)H(3):CH(3) from 193 nm photolysis of two different C(4)H(6) isomers (1-butyne and 1,3-butadiene). Photolysis of 1-butyne yielded values of σ(propargyl)(ion)(10.213 eV)=(26.1±4.2) Mb and σ(propargyl)(ion)(10.413 eV)=(23.4±3.2) Mb, whereas photolysis of 1,3-butadiene yielded values of σ(propargyl)(ion)(10.213 eV)=(23.6±3.6) Mb and σ(propargyl)(ion)(10.413 eV)=(25.1±3.5) Mb. These measurements place our relative photoionization cross-section spectrum for propargyl on an absolute scale between 8.6 and 10.5 eV. The cross-section derived from our results is approximately a factor of three larger than previous determinations.
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Affiliation(s)
- John D Savee
- Sandia National Laboratories, Combustion Research Facility, Livermore, California 94551, USA
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Gans B, Garcia GA, Boyé-Péronne S, Loison JC, Douin S, Gaie-Levrel F, Gauyacq D. Absolute Photoionization Cross Section of the Ethyl Radical in the Range 8–11.5 eV: Synchrotron and Vacuum Ultraviolet Laser Measurements. J Phys Chem A 2011; 115:5387-96. [DOI: 10.1021/jp202648m] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud 11, CNRS UMR 8214, F-91405 Orsay Cédex, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, B.P. 48, F-91192 Gif-sur-Yvette Cédex, France
| | - Séverine Boyé-Péronne
- Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud 11, CNRS UMR 8214, F-91405 Orsay Cédex, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, Université Bordeaux I, CNRS UMR 5255, F-33405 Talence Cédex, France
| | - Stéphane Douin
- Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud 11, CNRS UMR 8214, F-91405 Orsay Cédex, France
| | - François Gaie-Levrel
- Synchrotron SOLEIL, L'Orme des Merisiers, St Aubin, B.P. 48, F-91192 Gif-sur-Yvette Cédex, France
| | - Dolores Gauyacq
- Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud 11, CNRS UMR 8214, F-91405 Orsay Cédex, France
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Gans B, Boyé-Péronne S, Broquier M, Delsaut M, Douin S, Fellows CE, Halvick P, Loison JC, Lucchese RR, Gauyacq D. Photolysis of methane revisited at 121.6 nm and at 118.2 nm: quantum yields of the primary products, measured by mass spectrometry. Phys Chem Chem Phys 2011; 13:8140-52. [DOI: 10.1039/c0cp02627a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rio C, Flaud P, Loison J, Villenave E. Experimental Revaluation of the Importance of the Abstraction Channel in the Reactions of Monoterpenes with OH Radicals. Chemphyschem 2010; 11:3962-70. [DOI: 10.1002/cphc.201000518] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Caroline Rio
- Université de Bordeaux, Institut des Sciences Moléculaires, 351 Cours de la Libération, 33405 Talence Cedex (France), Fax.: (+33) 5‐4000‐6645
- CNRS UMR 5255, 351 Cours de la Libération, 33405 Talence Cedex (France)
| | - Pierre‐Marie Flaud
- Université de Bordeaux, Institut des Sciences Moléculaires, 351 Cours de la Libération, 33405 Talence Cedex (France), Fax.: (+33) 5‐4000‐6645
- CNRS UMR 5255, 351 Cours de la Libération, 33405 Talence Cedex (France)
| | - Jean‐Christophe Loison
- Université de Bordeaux, Institut des Sciences Moléculaires, 351 Cours de la Libération, 33405 Talence Cedex (France), Fax.: (+33) 5‐4000‐6645
- CNRS UMR 5255, 351 Cours de la Libération, 33405 Talence Cedex (France)
| | - Eric Villenave
- Université de Bordeaux, Institut des Sciences Moléculaires, 351 Cours de la Libération, 33405 Talence Cedex (France), Fax.: (+33) 5‐4000‐6645
- CNRS UMR 5255, 351 Cours de la Libération, 33405 Talence Cedex (France)
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