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Li Y, Suleimanov YV, Green WH, Guo H. Quantum rate coefficients and kinetic isotope effect for the reaction Cl + CH4 → HCl + CH3 from ring polymer molecular dynamics. J Phys Chem A 2014; 118:1989-96. [PMID: 24558961 DOI: 10.1021/jp501043z] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thermal rate coefficients and kinetic isotope effect have been calculated for prototypical heavy-light-heavy polyatomic bimolecular reactions Cl + CH4/CD4 → HCl/DCl + CH3/CD3, using a recently proposed quantum dynamics approach: ring polymer molecular dynamics (RPMD). Agreement with experimental rate coefficients, which are quite scattered, is satisfactory. However, differences up to 50% have been found between the RPMD results and those obtained from the harmonic variational transition-state theory on one of the two full-dimensional potential energy surfaces used in the calculations. Possible reasons for such discrepancy are discussed. The present work is an important step in a series of benchmark studies aimed at assessing accuracy for RPMD for chemical reaction rates, which demonstrates that this novel method is a quite reliable alternative to previously developed techniques based on transition-state theory.
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Affiliation(s)
- Yongle Li
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
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2
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Rate coefficients for the chemical reactions of CH2F2, CHClF2, CH2FCF3 and CH3CCl3 with O(1D) at 298K. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.10.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Ellingson BA, Pu J, Lin H, Zhao Y, Truhlar DG. Multicoefficient Gaussian-3 Calculation of the Rate Constant for the OH + CH4 Reaction and Its 12C/13C Kinetic Isotope Effect with Emphasis on the Effects of Coordinate System and Torsional Treatment. J Phys Chem A 2007; 111:11706-17. [DOI: 10.1021/jp072843j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Benjamin A. Ellingson
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455-0431, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Department of Chemistry, University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217
| | - Jingzhi Pu
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455-0431, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Department of Chemistry, University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217
| | - Hai Lin
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455-0431, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Department of Chemistry, University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217
| | - Yan Zhao
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455-0431, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Department of Chemistry, University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217
| | - Donald G. Truhlar
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant Street Southeast, Minneapolis, Minnesota 55455-0431, Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, and Department of Chemistry, University of Colorado at Denver and Health Sciences Center, Denver, Colorado 80217
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Mar KA, McCarthy MC, Connell P, Boering KA. Modeling the photochemical origins of the extreme deuterium enrichment in stratospheric H2. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007403] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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5
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Rhee TS, Brenninkmeijer CAM, Braß M, Brühl C. Isotopic composition of H2
from CH4
oxidation in the stratosphere and the troposphere. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006760] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tae Siek Rhee
- Atmospheric Chemistry Division; Max Planck Institute for Chemistry; Mainz Germany
| | | | - Marc Braß
- Atmospheric Physics Division; Max Planck Institute for Nuclear Physics; Heidelberg Germany
| | - Christoph Brühl
- Atmospheric Chemistry Division; Max Planck Institute for Chemistry; Mainz Germany
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Feilberg KL, D'Anna B, Johnson MS, Nielsen CJ. Relative Tropospheric Photolysis Rates of HCHO, H13CHO, HCH18O, and DCDO Measured at the European Photoreactor Facility. J Phys Chem A 2005; 109:8314-9. [PMID: 16834221 DOI: 10.1021/jp0513723] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The relative photolysis rates of HCHO, H13CHO, HCH18O, and DCDO were studied in pseudo-natural tropospheric conditions in July 2003 at the European Photoreactor Facility (EUPHORE) in Valencia, Spain. The photolytic decay of HCHO, H13CHO, and HCH18O is measured relative to DCDO by long path FT-IR detection during the course of about 3 h of sunlight. The relative photolysis rates obtained are as follows: JH13CHO/JHCHO = 0.894 +/- 0.006, JHCH18O/JHCHO = 0.911 +/- 0.011, and JDCDO/JHCHO = 0.597 +/- 0.001. The errors represent 1sigma and do not include possible systematic errors. The atmospheric implications of the large isotope effects in the photolysis of formaldehyde are discussed.
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Affiliation(s)
- Karen L Feilberg
- Department of Chemistry, University of Copenhagen, Universitetsparken 5 DK-2100 Copenhagen OE, Denmark
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Lin H, Zhao Y, Ellingson BA, Pu J, Truhlar DG. Temperature dependence of carbon-13 kinetic isotope effects of importance to global climate change. J Am Chem Soc 2005; 127:2830-1. [PMID: 15740100 DOI: 10.1021/ja0434026] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report here a theoretical study of the 13C kinetic isotope effect (KIE) and its temperature dependence for the reaction OH + CH4 --> H2O + CH3, the major sink of atmospheric methane in the troposphere. The KIE values at various atmospherically significant temperatures were determined by direct dynamics using variational transition state theory with multidimensional tunneling contributions (VTST/MT). The potential energy surfaces (PESs) were generated by hybrid density functional theory as well as by recently developed doubly hybrid density functional theory methods. Comparisons of our calculated KIEs with experimental data and theoretical values in the literature reveal the critical contributions due to multidimensional tunneling and torsion anharmonicity as well as the critical issue of the choice of internal rotational axis.
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Affiliation(s)
- Hai Lin
- Department of Chemistry and Supercomputer Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
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Park S. Measurements of N2O isotopologues in the stratosphere: Influence of transport on the apparent enrichment factors and the isotopologue fluxes to the troposphere. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd003731] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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9
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Feilberg KL, Griffith DWT, Johnson MS, Nielsen CJ. The13C and D kinetic isotope effects in the reaction of CH4 with Cl. INT J CHEM KINET 2004. [DOI: 10.1002/kin.20058] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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McCarthy MC. The hydrogen isotopic composition of water vapor entering the stratosphere inferred from high-precision measurements of δD-CH4and δD-H2. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jd004003] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rice AL. Carbon and hydrogen isotopic compositions of stratospheric methane: 1. High-precision observations from the NASA ER-2 aircraft. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd003042] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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