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Rodrigues R, Bou Debes D, Mendes M, Guerra P, Mestre G, Eden S, Cornetta LM, Ingólfsson O, da Silva FF. Experimental and Theoretical Study on Electron Ionization and Fragmentation of Propylene Oxide─the First Chiral Molecule Detected in the Interstellar Medium. J Phys Chem A 2024; 128:4795-4805. [PMID: 38860325 DOI: 10.1021/acs.jpca.4c02116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2024]
Abstract
Propylene oxide, CH3CHOCH2, is the first chiral molecule detected in space and the third C3 oxide detected toward the Sagittarius B2 (Sgr B2 (N)) molecular cloud, the others being propanal, CH3CH2CHO, and acetone, (CH3)2CO. With homochirality being ubiquitous in the building blocks of living matter, the formation and decay paths of propylene oxide in space are of specific interest. Motivated by the significant role of photo- and secondary electrons in astrochemistry, we have studied electron ionization and fragmentation of propylene oxide. Ion appearance energies are determined and compared to threshold values for the respective processes calculated at the G4MP2 level of theory, and potential reaction pathways are computed at the DFT level of theory. Electron ionization is found to destabilize propylene oxide, leading to barrierless opening of the C1-C2 bond of the epoxy ring, hydrogen transfer, and fragmentation over the methyl vinyl ether or rupture of the C2-O bond of the epoxy ring and fragmentation of the allyl alcohol cation as an intermediate, rather than direct bond ruptures.
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Affiliation(s)
- Rodrigo Rodrigues
- CEFITEC, Departamento de Física, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
| | - Daniel Bou Debes
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K
| | - Mónica Mendes
- CEFITEC, Departamento de Física, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
| | - Pedro Guerra
- CEFITEC, Departamento de Física, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
| | - Gonçalo Mestre
- CEFITEC, Departamento de Física, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
| | - Samuel Eden
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K
| | - Lucas M Cornetta
- Instituto de Física da Universidade de São Paulo, Universidade de São Paulo, São Paulo 05508-900, Brazil
| | - Oddur Ingólfsson
- Department of Chemistry and Science Institute, University of Iceland, Dunhagi 3, Reykjavik IS-107, Iceland
| | - F Ferreira da Silva
- CEFITEC, Departamento de Física, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2829-516, Portugal
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Yao Y, Kononov A, Metzlaff A, Wucher A, Kalkhoff L, Breuer L, Schleberger M, Schleife A. Nonequilibrium Dynamics of Electron Emission from Cold and Hot Graphene under Proton Irradiation. NANO LETTERS 2024; 24:5174-5181. [PMID: 38587459 DOI: 10.1021/acs.nanolett.4c00356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Characteristic properties of secondary electrons emitted from irradiated two-dimensional materials arise from multi-length and multi-time-scale relaxation processes that connect the initial nonequilibrium excited electron distribution with their eventual emission. To understand these processes, which are critical for using secondary electrons as high-resolution thermalization probes, we combine first-principles real-time electron dynamics with irradiation experiments. Our data for cold and hot proton-irradiated graphene show signatures of kinetic and potential emission and generally good agreement for electron yields between experiment and theory. The duration of the emission pulse is about 1.5 fs, which indicates high time resolution when used as a probe. Our newly developed method to predict kinetic energy spectra shows good agreement with electron and ion irradiation experiments and prior models. We find that the lattice temperature significantly increases secondary electron emission, whereas electron temperature has a negligible effect.
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Affiliation(s)
- Yifan Yao
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Alina Kononov
- Center for Computing Research, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Arne Metzlaff
- University of Duisburg-Essen, Faculty of Physics and CENIDE, 47057 Duisburg, Germany
| | - Andreas Wucher
- University of Duisburg-Essen, Faculty of Physics and CENIDE, 47057 Duisburg, Germany
| | - Lukas Kalkhoff
- University of Duisburg-Essen, Faculty of Physics and CENIDE, 47057 Duisburg, Germany
| | - Lars Breuer
- University of Duisburg-Essen, Faculty of Physics and CENIDE, 47057 Duisburg, Germany
| | - Marika Schleberger
- University of Duisburg-Essen, Faculty of Physics and CENIDE, 47057 Duisburg, Germany
| | - André Schleife
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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Mendes M, Bou-Debes D, Eden S, Bundaleski N, Teodoro OMND, Cornetta LM, Ferreira da Silva F. Electron ionization induced fragmentation pathways of trichloroanisole. Phys Chem Chem Phys 2023; 25:25361-25367. [PMID: 37703052 DOI: 10.1039/d3cp02019c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/14/2023]
Abstract
Trichloroanisole (TCA) is one of the most significant contaminants in cork stoppers. The presence of TCA leads to an unpleasant odor known as "cork taint", resulting in high economic losses for the cork and wine industries. Hence, the detection, quantification, and characterization of TCA are essential to address this concern. The present study investigates the electron-driven fragmentation pathways of TCA through electron ionization mass spectrometry as a function of electron energy (0-100 eV), and the results are supported by theoretical characterization of ionization potentials, dissociation thresholds, and electron ionization cross sections. The appearance energies of ten cations were measured, including the first experimental evaluation of the molecule's ionization energy at 8.8 ± 0.3 eV, in excellent agreement with the calculations (8.83 eV). For lower energies, around 20 eV, the parent cation accounted for more than 60% of the total ion signal, followed by its demethylated fragment. Taken together, these ion signals could be used as fingerprints of TCA in industrial quality control by low-energy electron ionization mass spectrometry. Fifty other fragments have been identified at higher electron energies, revealing the very rich fragmentation pattern of TCA.
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Affiliation(s)
- Mónica Mendes
- CEFITEC, Department of Physics, Nova School of Sciences and Technology, Caparica P-2829-516, Portugal.
| | - Daniel Bou-Debes
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Samuel Eden
- School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Nenad Bundaleski
- CEFITEC, Department of Physics, Nova School of Sciences and Technology, Caparica P-2829-516, Portugal.
| | - Orlando M N D Teodoro
- CEFITEC, Department of Physics, Nova School of Sciences and Technology, Caparica P-2829-516, Portugal.
| | - Lucas M Cornetta
- Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil.
| | - Filipe Ferreira da Silva
- CEFITEC, Department of Physics, Nova School of Sciences and Technology, Caparica P-2829-516, Portugal.
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Pereira‐da‐Silva J, Nunes A, Mendes M, Rodrigues R, Cornetta L, Ferreira da Silva F. Boroxine benzaldehyde complex for pharmaceutical applications probed by electron interactions. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9418. [PMID: 36261319 PMCID: PMC9787961 DOI: 10.1002/rcm.9418] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/06/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
RATIONALE 2,4,6-Tris(4-formylphenyl)boroxine (TFPB) is a substituted boroxine containing a benzaldehyde molecule bonded to each boron atom. Boroxine cages are an emerging class of functional nanostructures used in host-guest chemistry, and benzaldehyde is a potential radiosensitizer. Reactions initiated by low-energy electrons with such complexes may dictate and bring new fundamental knowledge for biomedical and pharmaceutical applications. METHODS The electron ionization properties of TFPB are investigated using a gas-phase electron-molecule crossed beam apparatus coupled with a reflectron time-of-flight mass spectrometer in an orthogonal geometry. Ionization and threshold energies are experimentally determined by mass spectra acquisition as a function of the electron energy. RESULTS The abundance of the molecular precursor cation in the mass spectrum at 70 eV is significantly lower than that of the most abundant fragment C7 H5 O+ . Twenty-nine cationic fragments with relative intensities >2% are detected and identified. The appearance energies of six fragment cations are reported, and the experimental first ionization potential is found at 9.46 ± 0.11 eV. Moreover, eight double cations are identified. The present results are supported by quantum chemical calculations based on bound state techniques, electron ionization models and thermodynamic thresholds. CONCLUSIONS According to these results, the TPFB properties may combine the potential radiosensitizer effect of benzaldehyde with the stability of the boroxine ring.
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Affiliation(s)
- Joao Pereira‐da‐Silva
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Ana Nunes
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Monica Mendes
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Rodrigo Rodrigues
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Lucas Cornetta
- Instituto de Física Gleb WataghinUniversidade Estadual de Campinas, CampinasSão PauloBrazil
| | - Filipe Ferreira da Silva
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
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Armenta Butt S, Price SD. Bimolecular reactions of S 2+ with Ar, H 2 and N 2: reactivity and dynamics. Phys Chem Chem Phys 2022; 24:8113-8128. [PMID: 35322816 DOI: 10.1039/d1cp05397c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity, energetics and dynamics of bimolecular reactions between S2+ and three neutral species (Ar, H2 and N2) have been studied using a position-sensitive coincidence methodology at centre-of-mass collision energies below 6 eV. This is the first study of bimolecular reactions involving S2+, a species detected in planetary ionospheres, the interstellar medium, and in anthropogenic manufacturing processes. The reactant dication beam employed consists predominantly of S2+ in the ground 3P state, but some excited states are also present. Most of the observed reactions involve the ground state of S2+, but the dissociative electron transfer reactions appear to exclusively involve excited states of this atomic dication. We observe exclusively single electron-transfer between S2+ and Ar, a process which exhibits strong forward scatting typical of the Landau-Zener style dynamics observed for other dicationic electron transfer reactions. Following collisions between S2+ + H2, non-dissociative and dissociative single electron-transfer reactions were detected. The dynamics here show evidence for the formation of a long-lived collision complex, [SH2]2+, in the dissociative single electron-transfer channel. The formation of SH+ was not observed. In contrast, the collisions of S2+ + N2 result in the formation of SN+ + N+ in addition to the products of single electron-transfer reactions.
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Affiliation(s)
- Sam Armenta Butt
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
| | - Stephen D Price
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
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Pereira da Silva J, Mendes M, Nunes A, Araújo J, Cornetta LM, Ferreira da Silva F. Triphenylboroxine stability under low energy electron interactions. Phys Chem Chem Phys 2022; 24:10025-10032. [DOI: 10.1039/d2cp00855f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Triphenylboroxine (TFB) has chemical properties of great interest in organic synthesis allowing the development of promising molecular architectures. Based on the possibility of geometric arrangement of N-coordinated boron atoms, the...
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Pereira-da-Silva J, Rodrigues R, Ramos J, Brígido C, Botnari A, Silvestre M, Ameixa J, Mendes M, Zappa F, Mullock SJ, Araújo JMM, Varella MTDN, Cornetta LM, da Silva FF. Electron Driven Reactions in Tetrafluoroethane: Positive and Negative Ion Formation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:1459-1468. [PMID: 33998788 DOI: 10.1021/jasms.1c00057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In the search for alternatives to chlorine-containing gases, tetrafluoroethane, CF3CH2F (R134a), a widely used refrigerant gas, has been recognized as a promising substitute for dichlorodifluoromethane, CCl2F2 (R12). When R12 is replaced by R134a, the global warming potential drops from 8100 to 1430, the ozone depletion potential changes from 1 to 0, and the atmospheric lifetime decreases from 100 to 14 years. Electron interactions in the gas phase play a fundamental role in the atmospheric sciences. Here, we present a detailed study on electron-driven fragmentation pathways of CF3CH2F, in which we have investigated processes induced by both electron ionization and electron attachment. The measurements allow us to report the ion efficiency curves for ion formation in the energy range of 0 up to 25 eV. For positive ion formation, R134a dissociates into a wide assortment of ions, in which CF3+ is observed as the most abundant out of seven ions with a relative intensity above 2%. The results are supported by quantum chemical calculations based on bound state techniques, electron-impact ionization models, and electron-molecule scattering simulations, showing a good agreement. Moreover, the experimental first ionization potential was found at 13.10 ± 0.17 eV and the second at around 14.25 eV. For negative ion formation, C2F3- was detected as the only anion formed, above 8.3 eV. This study demonstrates the role of electrons in the dissociation of R134a, which is relevant for an improvement of the refrigeration processes as well as in atmospheric chemistry and plasma sciences.
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Affiliation(s)
- João Pereira-da-Silva
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Rodrigo Rodrigues
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - João Ramos
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Carlos Brígido
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Alexandru Botnari
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Miguel Silvestre
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - João Ameixa
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Mónica Mendes
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Fábio Zappa
- Departamento de Física-ICE, Universidade Federal de Juiz de Fora, Campus Universitário, 36036-900 Juiz de Fora, MG, Brazil
| | - Stephen J Mullock
- Kore Technology Ltd., Cambridge Science Park, Cambridge CB4 4WF, U.K
| | - João M M Araújo
- LAQV, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
| | - Márcio T do N Varella
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, 05508-090 São Paulo, Brazil
| | - Lucas M Cornetta
- Instituto de Física Gleb Wataghin da Universidade Estadual de Campinas, 13083-859 Campinas, Brazil
| | - Filipe Ferreira da Silva
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
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Corinti D, Catone D, Turchini S, Rondino F, Crestoni ME, Fornarini S. Photoionization mass spectrometry of ω-phenylalkylamines: Role of radical cation-π interaction. J Chem Phys 2018; 148:164307. [DOI: 10.1063/1.5027786] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Davide Corinti
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza,” P.le A. Moro 5, I-00185 Roma, Italy
| | - Daniele Catone
- CNR-ISM, Area della Ricerca di Roma Tor Vergata, Via del Fosso del Cavaliere 100, Roma, Italy
| | - Stefano Turchini
- CNR-ISM, Area della Ricerca di Roma Tor Vergata, Via del Fosso del Cavaliere 100, Roma, Italy
| | - Flaminia Rondino
- C. R. ENEA Frascati, FSN-TECFIS, Via E. Fermi 45, 00044 Frascati, Italy
| | - Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza,” P.le A. Moro 5, I-00185 Roma, Italy
| | - Simonetta Fornarini
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza,” P.le A. Moro 5, I-00185 Roma, Italy
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Govoni M, Galli G. GW100: Comparison of Methods and Accuracy of Results Obtained with the WEST Code. J Chem Theory Comput 2018; 14:1895-1909. [PMID: 29397712 DOI: 10.1021/acs.jctc.7b00952] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reproducibility of calculations carried out within many-body perturbation theory at the G0 W0 level is assessed for 100 closed shell molecules and compared to that of density functional theory. We consider vertical ionization potentials (VIP) and electron affinities (VEA) obtained with five different codes: BerkeleyGW, FHI-aims, TURBOMOLE, VASP, and WEST. We review the approximations and parameters that control the accuracy of G0 W0 results in each code, and we discuss in detail the effect of extrapolation techniques for the parameters entering the WEST code. Differences between the VIP and VEA computed with the various codes are within ∼60 and ∼120 meV, respectively, which is up to four times larger than in the case of the best results obtained with DFT codes. Vertical ionization potentials are validated against experiment and CCSD(T) quantum chemistry results showing a mean absolute relative error of ∼4% for data obtained with WEST. Our analysis of the differences between localized orbitals and plane-wave implementations points out molecules containing Cu, I, Ga, and Xe as major sources of discrepancies, which call for a re-evaluation of the pseudopotentials used for these systems in G0 W0 calculations.
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Affiliation(s)
- Marco Govoni
- Institute for Molecular Engineering and Materials Science Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States
| | - Giulia Galli
- Institute for Molecular Engineering and Materials Science Division , Argonne National Laboratory , Lemont , Illinois 60439 , United States
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10
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A vacuum ultraviolet photoionization study on the thermal decomposition of ammonium perchlorate. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2017.11.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Maggio E, Liu P, van Setten MJ, Kresse G. GW100: A Plane Wave Perspective for Small Molecules. J Chem Theory Comput 2017; 13:635-648. [DOI: 10.1021/acs.jctc.6b01150] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Emanuele Maggio
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, Sensengasse 8/12, A-1090 Vienna, Austria
| | - Peitao Liu
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, Sensengasse 8/12, A-1090 Vienna, Austria
- Institute
of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - Michiel J. van Setten
- Nanoscopic
Physics, Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Georg Kresse
- Faculty
of Physics and Center for Computational Materials Science, University of Vienna, Sensengasse 8/12, A-1090 Vienna, Austria
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Burgess DR. An Evaluation of Gas Phase Enthalpies of Formation for Hydrogen-Oxygen (H xO y) Species. JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 2016; 121:108-138. [PMID: 34434616 PMCID: PMC7339710 DOI: 10.6028/jres.121.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/11/2016] [Indexed: 06/13/2023]
Abstract
We have compiled gas phase enthalpies of formation for nine hydrogen-oxygen species (HxOy) and selected recommended values for H, O, OH, H2O, HO2, H2O2, O3, HO3, and H2O3. The compilation consists of values derived from experimental measurements, quantum chemical calculations, and prior evaluations. This work updates the recommended values in the NIST-JANAF (1985) and Gurvich et al. (1989) thermochemical tables for seven species. For two species, HO3 and H2O3 (important in atmospheric chemistry) and not found in prior thermochemical evaluations, we also provide supplementary data consisting of molecular geometries, vibrational frequencies, and torsional potentials which can be used to compute thermochemical functions. For all species, we also provide supplementary data consisting of zero point energies, vibrational frequencies, and ion reaction energetics.
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Affiliation(s)
- Donald R Burgess
- National Institute of Standards and Technology, Gaithersburg, MD 20899
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Lynch PT, Troy TP, Ahmed M, Tranter RS. Probing Combustion Chemistry in a Miniature Shock Tube with Synchrotron VUV Photo Ionization Mass Spectrometry. Anal Chem 2015; 87:2345-52. [DOI: 10.1021/ac5041633] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patrick T. Lynch
- Chemical
Science and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Tyler P. Troy
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Musahid Ahmed
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Robert S. Tranter
- Chemical
Science and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
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Ludwig RM, Moore DT. Formation of ionic complexes in cryogenic matrices: A case study using co-deposition of Cu−with rare gas cations in solid argon. J Chem Phys 2013; 139:244202. [DOI: 10.1063/1.4851335] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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Thompson MGK, Linford BD, Parnis JM. Electron-bombardment matrix isolation and PEPICO studies as complementary techniques in ion chemistry: an FTIR study of the decomposition of the vinyl fluoride cation. JOURNAL OF MASS SPECTROMETRY : JMS 2011; 46:344-351. [PMID: 21438083 DOI: 10.1002/jms.1898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
FTIR spectra have been obtained for matrices formed following electron bombardment of gas mixtures containing varying amounts of vinyl fluoride (VF) in Ar (1:400 to 1:25,600; VF/Ar). The major matrix-isolated products are a π-complex of HF/C(2)H(2) , fluoroacetylene (HC≡CF) and two isomers of C(2)H(2)F(•). These products correspond well with the products of photoionization of VF near 15.8 eV. These observations support the dominant mechanism of ionization in the EB-MI environment as charge transfer of the substrate molecule to Ar(•+). Some differences are noted between the observed EB-MI products and the results from PEPICO studies, primarily in that the EB-MI products are observed as neutralized forms. The close correlation in EB-MI and photoionization results allows the EB-MI technique to be utilized as an ion structural analysis tool in complement to PEPICO studies, and allows the use of PEPICO studies to help predict and elucidate high-pressure chemistry mechanisms through EB-MI studies. The differences in the EB-MI results and ions observed using the PEPICO technique are rationalized in terms of the differences in the experimental techniques. Using VF as the test system, reagent partial pressure conditions that best complement PEPICO studies are determined. Although the major results are observed for all VF partial pressures, dilute samples give rise to further ionization of the primary products, and more concentrated samples give rise to radical-radical reaction chemistry. As a result, a nominal range of 1:3200 (VF/Ar) is demonstrated to provide the best correlation with the gas-phase PEPICO measurements.
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Güthe F, Weitzel KM. Measurement of the rate constant k(E) of the unimolecular H2 elimination from ethane radical cations in a reflectron mass spectrometer. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971010322] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mähnert J, Güthe F, Weitzel KM. The determination of transition state properties in the ethane and ethene ion dissociation. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19961001118] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ruscic B, Pinzon RE, Morton ML, von Laszevski G, Bittner SJ, Nijsure SG, Amin KA, Minkoff M, Wagner AF. Introduction to Active Thermochemical Tables: Several “Key” Enthalpies of Formation Revisited. J Phys Chem A 2004. [DOI: 10.1021/jp047912y] [Citation(s) in RCA: 503] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Branko Ruscic
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Reinhardt E. Pinzon
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Melita L. Morton
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Gregor von Laszevski
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Sandra J. Bittner
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Sandeep G. Nijsure
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Kaizar A. Amin
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Michael Minkoff
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
| | - Albert F. Wagner
- Chemistry Division and Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois 60439
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Jacox ME, Thompson WE. Infrared spectra of HOCO+ and of the complex of H2 with CO2− trapped in solid neon. J Chem Phys 2003. [DOI: 10.1063/1.1621383] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Abstract
The recent developments of vacuum ultraviolet (VUV) laser and third generation synchrotron radiation sources, together with the introduction of pulsed field ionization (PFI) schemes for photoion-photoelectron detection, have had a profound impact on the field of VUV spectroscopy and chemistry. Owing to the mediation of near-resonant autoionizing states, rovibronic states of ions with negligible Franck-Condon factors for direct photoionization can be examined by VUV-PFI measurements with rotational resolutions. The VUV-PFI spectra thus obtained have provided definitive ionization energies (IEs) for many small molecules. The recent synchrotron-based PFI-photoelectron-photoion coincidence experiments have demonstrated that dissociative photoionization thresholds for a range of molecules can be determined to the same precision as in PFI-photoelectron measurements. Combining appropriate dissociation thresholds and IEs measured in PFI studies, thermochemical data for many neutrals and cations can be determined with unprecedented precision. The further development of two-color excitation-ionization schemes promises to expand the scope of spectroscopic and chemical applications using the photoionization-photoelectron method.
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Affiliation(s)
- Cheuk-Yiu Ng
- Department of Chemistry, University of California, Davis, California 95616, USA.
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Hanel G, Gstir B, Fiegele T, Hagelberg F, Becker K, Scheier P, Snegursky A, Märk TD. Isotope effects in the electron impact ionization of H2/D2, H2O/D2O, and C6H6/C6D6 near threshold. J Chem Phys 2002. [DOI: 10.1063/1.1428341] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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Lugez CL, Jacox ME, Johnson RD. Vibrational spectra of molecular ions isolated in solid neon. XV. Infrared spectroscopic evidence for NeHF+ and HFFH+. J Chem Phys 1999. [DOI: 10.1063/1.478402] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Distinguishing the formation of C2D+4 ions from C2D+6 (by D2 loss) and from C2D5H+ (by HD loss) in a Reflectron spectrometer. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0168-1176(97)00116-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Weitzel KM, Güthe F. The distinction of direct and pulsed-field ionized zero kinetic energy photoelectrons in electron/ion coincidence experiments. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00104-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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The appearance energy of C2H+ from C2H2 revisited. A photoion-photoelectron coincidence spectroscopic determination. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)00182-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Weitzel KM, Mähnert J, Penno M. Rotational effects in ionic reactions investigated by the ZEKE-PEPICO technique. Chem Phys 1994. [DOI: 10.1016/0301-0104(94)00208-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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