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Campbell JS, Nauta K, Hansen CS, Kable SH. POPTARTS: A New Method to Determine Quantum Yields in a Molecular Beam. J Phys Chem A 2022; 126:9268-9275. [DOI: 10.1021/acs.jpca.2c06289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Affiliation(s)
- Jyoti S. Campbell
- School of Chemistry, University of New South Wales, Kensington, NSW2052, Australia
| | - Klaas Nauta
- School of Chemistry, University of New South Wales, Kensington, NSW2052, Australia
| | | | - Scott H. Kable
- School of Chemistry, University of New South Wales, Kensington, NSW2052, Australia
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2
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Ashfold MNR, Ingle RA, Karsili TNV, Zhang J. Photoinduced C–H bond fission in prototypical organic molecules and radicals. Phys Chem Chem Phys 2019; 21:13880-13901. [DOI: 10.1039/c8cp07454b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We survey and assess current knowledge regarding the primary photochemistry of hydrocarbon molecules and radicals.
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Affiliation(s)
| | | | | | - Jingsong Zhang
- Department of Chemistry
- University of California at Riverside
- Riverside
- USA
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3
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Quinn MS, Andrews DU, Nauta K, Jordan MJT, Kable SH. The energy dependence of CO(v,J) produced from H2CO via the transition state, roaming, and triple fragmentation channels. J Chem Phys 2017; 147:013935. [DOI: 10.1063/1.4983138] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Mitchell S. Quinn
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Duncan U. Andrews
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Klaas Nauta
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia
| | | | - Scott H. Kable
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia
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4
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Wang X, Houston PL, Bowman JM. A new (multi-reference configuration interaction) potential energy surface for H 2CO and preliminary studies of roaming. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2017; 375:20160194. [PMID: 28320899 PMCID: PMC5360895 DOI: 10.1098/rsta.2016.0194] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/05/2016] [Indexed: 06/06/2023]
Abstract
We report a new global potential energy surface (PES) for H2CO, based on precise fitting of roughly 67 000 MRCI/cc-pVTZ energies. This PES describes the global minimum, the cis- and trans-HCOH isomers, and barriers relevant to isomerization, formation of the molecular (H2+CO) and radical (H+HCO) products, and the loose so-called roaming transition-state saddle point. The key features of the PES are reviewed and compared with a previous PES, denoted by PES04, based on five local fits that are 'stitched' together by switching functions (Zhang et al. 2004 J. Phys. Chem. A108, 8980-8986 (doi:10.1021/jp048339l)). Preliminary quasi-classical trajectory calculations are performed at the total energy of 36 233 cm-1 (103 kcal mol-1), relative to the H2CO global minimum, using the new PES, with a particular focus on roaming dynamics. When compared with the results from PES04, the new PES findings show similar rotational distributions, somewhat more roaming and substantially higher H2 vibrational excitation.This article is part of the themed issue 'Theoretical and computational studies of non-equilibrium and non-statistical dynamics in the gas phase, in the condensed phase and at interfaces'.
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Affiliation(s)
- Xiaohong Wang
- Department of Chemistry, and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, GA 30322, USA
| | - Paul L Houston
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, NY 14852, USA
| | - Joel M Bowman
- Department of Chemistry, and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, GA 30322, USA
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Wang J, Gao CZ, Calvayrac F, Zhang FS. Collision dynamics of proton with formaldehyde: fragmentation and ionization. J Chem Phys 2014; 140:124306. [PMID: 24697440 DOI: 10.1063/1.4868985] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using time-dependent density functional theory, applied to the valence electrons and coupled non-adiabatically to molecular dynamics of the ions, we study the ionization and fragmentation of formaldehyde in collision with a proton. Four different impact energies: 35 eV, 85 eV, 135 eV, and 300 eV are chosen in order to study the energy effect in the low energy region, and ten different incident orientations at 85 eV are considered for investigating the steric effect. Fragmentation ratios, single, double, and total electron ionization cross sections are calculated. For large impact parameters, these results are close to zero irrespective of the incident orientations due to a weak projectile-target interaction. For small impact parameters, the results strongly depend on the collision energy and orientation. We also give the kinetic energy releases and scattering angles of protons, as well as the cross section of different ion fragments and the corresponding reaction channels.
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Affiliation(s)
- Jing Wang
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Cong-Zhang Gao
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Florent Calvayrac
- Institut des Molecules et Matériaux du Mans UMR 6283, Université du Maine, LUNAM 72085 Le Mans Cedex 9, France
| | - Feng-Shou Zhang
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
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Tatum Ernest C, Bauer D, Hynes AJ. Radical quantum yields from formaldehyde photolysis in the 30,400-32,890 cm(-1) (304-329 nm) spectral region: detection of radical photoproducts using pulsed laser photolysis-pulsed laser induced fluorescence. J Phys Chem A 2012; 116:6983-95. [PMID: 22625180 DOI: 10.1021/jp2117399] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The relative quantum yield for the production of radical products, H + HCO, from the UV photolysis of formaldehyde (HCHO) has been measured using a pulsed laser photolysis–pulsed laser induced fluorescence (PLP–PLIF) technique across the 30,400–32,890 cm(–1) (304–329 nm) spectral region of the Ã(1)A2–X̃(1)A1 electronic transition. The photolysis laser had a bandwidth of 0.09 cm(–1), which is slightly broader than the Doppler width of a rotational line of formaldehyde at 300 K (0.07 cm(–1)), and the yield spectrum shows detailed rotational structure. The H and HCO photofragments were monitored using LIF of the OH radical as a spectroscopic marker. The OH radicals were produced by rapid reaction of the H and HCO photofragments with NO2. This technique produced an “action” spectrum that at any photolysis wavelength is the product of the H + HCO radical quantum yield and HCHO absorption cross section at the photolysis wavelength and is a relative measurement. Using the HCHO absorption cross section previously obtained in this laboratory, the relative quantum yield was determined two different ways. One produced band specific yields, and the other produced yields averaged over each 100 cm(–1). Yields were normalized to a value of 0.69 at 31,750 cm(–1) based on the current recommendation of Sander et al. (Sander, S. P.; Abbatt, J.; Barker, J. R.; Burkholder, J. B.; Friedl, R. R.; Golden, D. M.; Huie, R. E.; Kolb, C. E.; Kurylo, M. J.; Moortgat, G. K.; et al. Chemical Kinetics and Photochemical Data for Use in Atmospheric Studies, Evaluation No. 17; Jet Propulsion Laboratory: Pasadena, CA, USA, 2011). The resulting radical quantum yields agree well with previous experimental studies and the current JPL recommendation but show greater wavelength dependent structure. A significant decrease in the quantum yield was observed for the 5(0)(1) + 1(0)(1)4(0)(1) combination band centered at 31,125 cm(–1). This band has a low absorption cross section and has little impact on the calculated atmospheric photodissociation rate but is a further indication of the complexity of HCHO photodissociation dynamics.
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Affiliation(s)
- Cheryl Tatum Ernest
- Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149, United States
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Tatum Ernest C, Bauer D, Hynes AJ. High-Resolution Absorption Cross Sections of Formaldehyde in the 30285–32890 cm–1 (304–330 nm) Spectral Region. J Phys Chem A 2012; 116:5910-22. [PMID: 22233296 DOI: 10.1021/jp210008g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cheryl Tatum Ernest
- Division of Marine and Atmospheric Chemistry, Rosenstiel
School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida
33149, United States
| | - Dieter Bauer
- Division of Marine and Atmospheric Chemistry, Rosenstiel
School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida
33149, United States
| | - Anthony J. Hynes
- Division of Marine and Atmospheric Chemistry, Rosenstiel
School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida
33149, United States
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Fu B, Shepler BC, Bowman JM. Three-State Trajectory Surface Hopping Studies of the Photodissociation Dynamics of Formaldehyde on ab Initio Potential Energy Surfaces. J Am Chem Soc 2011; 133:7957-68. [DOI: 10.1021/ja201559r] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bina Fu
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Benjamin C. Shepler
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Joel M. Bowman
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
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Walser AM, Meisinger M, Radi PP, Gerber T, Knopp G. Resonant UV-fs-TCFWM spectroscopy on formaldehyde. Phys Chem Chem Phys 2009; 11:8456-66. [PMID: 19774276 DOI: 10.1039/b907133d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Andreas M Walser
- Paul Scherrer Institute, General Energy Research, CH-5232 Villigen PSI, Switzerland
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Hopkins WS, Loock HP, Cronin B, Nix MGD, Devine AL, Dixon RN, Ashfold MNR, Yin HM, Rowling SJ, Büll A, Kable SH. Quantitative (υ, N, Ka) Product State Distributions near the Triplet Threshold for the Reaction H2CO → H + HCO Measured by Rydberg Tagging and Laser-Induced Fluorescence. J Phys Chem A 2008; 112:9283-9. [DOI: 10.1021/jp8021826] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- W. Scott Hopkins
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Hans-Peter Loock
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Bríd Cronin
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Michael G. D. Nix
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Adam L. Devine
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Richard N. Dixon
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Michael N. R. Ashfold
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Hong-Ming Yin
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Steven J. Rowling
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Alexander Büll
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
| | - Scott H. Kable
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada, School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K., and School of Chemistry, University of Sydney, NSW 2006, Australia
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Farnum JD, Bowman JM. Phase Space Analysis of Formaldehyde Dissociation Branching and Comparison with Quasiclassical Trajectory Calculations†. J Phys Chem A 2007; 111:10376-80. [PMID: 17629255 DOI: 10.1021/jp072617+] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate the dependence of the branching ratio of formaldehyde dissociation to molecular and radical products on the total energy and angular momentum and the HCO rotational state distributions by using a combination of transition state/Rice-Ramsperger-Kassel-Marcus theory and phase space theory. Comparisons are made with recent quasiclassical trajectory (QCT) calculations [Farnum, J. D.; Zhang, X.; Bowman, J. M. J. Chem. Phys. 2007, 126, 134305]. The combined phase-space analysis is in semiquantitative agreement with the QCT results for the rotational distributions of HCO but is only in qualitative agreement for the branching ratio. Nevertheless, that level of agreement serves to provide insight into the QCT results, which showed suppression of the radical channel with increasing total angular momentum for a fixed total energy.
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Affiliation(s)
- John D Farnum
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, USA
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Yin HM, Kable SH, Zhang X, Bowman JM. Signatures of H2CO photodissociation from two electronic states. Science 2006; 311:1443-6. [PMID: 16527976 DOI: 10.1126/science.1123397] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Even in small molecules, the influence of electronic state on rotational and vibrational product energies is not well understood. Here, we use experiments and theory to address this issue in photodissociation of formaldehyde, H2CO, to the radical products H + HCO. These products result from dissociation from the singlet ground electronic state or the first excited triplet state (T1) of H2CO. Fluorescence spectra reveal a sudden decrease in the HCO rotational energy with increasing photolysis energy accompanied by substantial HCO vibrational excitation. Calculations of the rotational distribution using an ab initio potential energy surface for the T1 state are in very good agreement with experiment and strongly support dominance of the T1 state in the dynamics at the higher photolysis energies.
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Affiliation(s)
- H M Yin
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
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Bowman JM, Zhang X. New insights on reaction dynamics from formaldehyde photodissociation. Phys Chem Chem Phys 2006; 8:321-32. [PMID: 16482274 DOI: 10.1039/b512847c] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We review the photodissociation dynamics of formaldehyde with an emphasis on recent calculations that make use of a global ab initio-based potential energy surface for the S(0) state. These calculations together with recent experiments reveal striking departures from conventional transition state theory for the formation of the molecular products H(2) + CO. The evidence for this departure is reviewed in detail by examining properties of the new potential surface and results of quasiclassical trajectory dynamics calculations using this surface. We also review very recent work on the dynamics governing the formation of radical products, H + HCO. These products can be formed on the T(1) surface as well as the S(0) one, and we present some results contrasting the dynamics on these two surfaces. This work makes use of a new semi-global ab initio-based T(1) potential energy surface.
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Affiliation(s)
- Joel M Bowman
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, GA 30322, USA.
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Affiliation(s)
- H Sato
- Laser Photochemistry Research Group, Department of Chemistry for Materials, Faculty of Engineering, Mi'e University, 1515 Kamihamacho, Tsu 514-8507, Japan.
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Valachovic LR, Tuchler MF, Dulligan M, Droz-Georget T, Zyrianov M, Kolessov A, Reisler H, Wittig C. Photoinitiated H2CO unimolecular decomposition: Accessing H+HCO products via S0 and T1 pathways. J Chem Phys 2000. [DOI: 10.1063/1.480849] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Yamaguchi Y, Wesolowski SS, Van Huis TJ, Schaefer HF. The unimolecular dissociation of H2CO on the lowest triplet potential-energy surface. J Chem Phys 1998. [DOI: 10.1063/1.476315] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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