51
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Clary DC. Spiers Memorial Lecture : Introductory lecture: quantum dynamics of chemical reactions. Faraday Discuss 2018; 212:9-32. [DOI: 10.1039/c8fd00131f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Spiers Memorial Lecture discusses quantum effects that can be calculated and observed in the chemical reactions of small molecules.
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Affiliation(s)
- David C. Clary
- Physical and Theoretical Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- Oxford
- UK
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52
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Biczysko M, Bloino J, Puzzarini C. Computational challenges in Astrochemistry. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2017. [DOI: 10.1002/wcms.1349] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Malgorzata Biczysko
- International Center for Quantum and Molecular Structures, College of SciencesShanghai University Shanghai China
| | - Julien Bloino
- Consiglio Nazionale delle Ricerche, Istituto di Chimica dei Composti OrganoMetalliciUOS di Pisa, Area della Ricerca CNR Pisa Italy
- Scuola Normale Superiore Classe di Scienze, Pisa Italy
| | - Cristina Puzzarini
- Department of Chemistry “Giacomo Ciamician”University of Bologna Bologna Italy
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53
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Saheb V, Hashemi SR, Hosseini SMA. Theoretical Studies on the Kinetics of Multi-Channel Gas-Phase Unimolecular Decomposition of Acetaldehyde. J Phys Chem A 2017; 121:6887-6895. [PMID: 28825298 DOI: 10.1021/acs.jpca.7b04771] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Theoretical kinetic studies are performed on the multichannel thermal decomposition of acetaldehyde. The geometries of the stationary points on the potential energy surface of the reaction are optimized at the MP2(full)/6-311++G(2d,2p) level of theory. More accurate energies are obtained by single point energy calculations at the CCSD(T,full)/augh-cc-pVTZ+2df, CBS-Q and G4 levels of theory. Here, by application of steady-state approximation to the thermally activated species CH3CHO* and CH2CHOH* and performance of statistical mechanical manipulations, expressions for the rate constants for different product channels are derived. Special attempts are made to compute accurate energy-specific rate coefficients for different channels by using semiclassical transition state theory. It is found that the isomerization of CH3CHO to the enol-form CH2CHOH plays a significant role in the unimolecular reaction of CH3CHO. The possible products of the reaction are formed via unimolecular decomposition of CH3CHO and CH2CHOH. The computed rate coefficients reveal that the dominant channel at low temperatures and high pressures is the formation of CH2CHOH due to the low barrier height for CH3CHO → CH2CHOH isomerization process. However, at high temperatures, the product channel CH3 + CHO becomes dominant.
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Affiliation(s)
- Vahid Saheb
- Department of Chemistry, Shahid Bahonar University of Kerman , Kerman 76169, Iran
| | - S Rasoul Hashemi
- Department of Chemistry, Shahid Bahonar University of Kerman , Kerman 76169, Iran
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54
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Shan X, Vincent JC, Kirkpatrick S, Walker MD, Sambrook MR, Clary DC. A Combined Theoretical and Experimental Study of Sarin (GB) Decomposition at High Temperatures. J Phys Chem A 2017; 121:6200-6210. [PMID: 28704051 DOI: 10.1021/acs.jpca.7b04282] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Theoretical and experimental results are presented for the pyrolytic decomposition of the nerve agent sarin (GB) in the gas phase. High-level quantum chemistry calculations are performed together with a semiclassical transition-state theory for describing quantum mechanical tunneling. The experimental and theoretical results for the temperature dependence of the survival times show very good agreement, as does the calculated and measured activation energy for thermal decomposition. The combined results suggest that the thermal decomposition of GB, for temperature ranging from 350 to 500 °C, goes through a pericyclic reaction mechanism with a transition state consisting of a six-membered ring structure.
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Affiliation(s)
- Xiao Shan
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Jack C Vincent
- CBR Division, DSTL Porton Down , Salisbury SP4 0JQ, United Kingdom
| | - Sue Kirkpatrick
- CBR Division, DSTL Porton Down , Salisbury SP4 0JQ, United Kingdom
| | - Maurice D Walker
- CBR Division, DSTL Porton Down , Salisbury SP4 0JQ, United Kingdom
| | - Mark R Sambrook
- CBR Division, DSTL Porton Down , Salisbury SP4 0JQ, United Kingdom
| | - David C Clary
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
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55
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Aieta C, Ceotto M. A quantum method for thermal rate constant calculations from stationary phase approximation of the thermal flux-flux correlation function integral. J Chem Phys 2017; 146:214115. [DOI: 10.1063/1.4984099] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Chiara Aieta
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy
| | - Michele Ceotto
- Dipartimento di Chimica, Università degli Studi di Milano, Via C. Golgi 19, 20133 Milano, Italy
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56
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McConnell SR, Löhle A, Kästner J. Rate constants from instanton theory via a microcanonical approach. J Chem Phys 2017; 146:074105. [DOI: 10.1063/1.4976129] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sean R. McConnell
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Andreas Löhle
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Johannes Kästner
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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57
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Yin C, Takahashi K. How does substitution affect the unimolecular reaction rates of Criegee intermediates? Phys Chem Chem Phys 2017; 19:12075-12084. [DOI: 10.1039/c7cp01091e] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unimolecular reaction rates of Criegee intermediates show substitution effect.
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Affiliation(s)
- Cangtao Yin
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei
- Taiwan
| | - Kaito Takahashi
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei
- Taiwan
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58
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Fu B, Shan X, Zhang DH, Clary DC. Recent advances in quantum scattering calculations on polyatomic bimolecular reactions. Chem Soc Rev 2017; 46:7625-7649. [DOI: 10.1039/c7cs00526a] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review surveys quantum scattering calculations on chemical reactions of polyatomic molecules in the gas phase published in the last ten years.
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Affiliation(s)
- Bina Fu
- State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical and Computational Chemistry
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- China
| | - Xiao Shan
- Physical and Theoretical Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- Oxford
- UK
| | - Dong H. Zhang
- State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical and Computational Chemistry
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- China
| | - David C. Clary
- Physical and Theoretical Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- Oxford
- UK
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59
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Castillo JF, Suleimanov YV. A ring polymer molecular dynamics study of the OH + H2(D2) reaction. Phys Chem Chem Phys 2017; 19:29170-29176. [DOI: 10.1039/c7cp05266a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using ring polymer molecular dynamics we have calculated the rate coefficients for the OH + H2 reaction.
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Affiliation(s)
- J. F. Castillo
- Departamento de Química Física I
- Facultad de CC. Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Y. V. Suleimanov
- Computation-based Science and Technology Research Center
- Cyprus Institute
- Nicosia 2121
- Cyprus
- Department of Chemical Engineering
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60
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Nguyen TL, McCaslin L, McCarthy MC, Stanton JF. Communication: Thermal unimolecular decomposition of syn-CH3CHOO: A kinetic study. J Chem Phys 2016; 145:131102. [DOI: 10.1063/1.4964393] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Thanh Lam Nguyen
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Laura McCaslin
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Michael C. McCarthy
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
| | - John F. Stanton
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA
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61
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Stanton JF. Semiclassical Transition-State Theory Based on Fourth-Order Vibrational Perturbation Theory: The Symmetrical Eckart Barrier. J Phys Chem Lett 2016; 7:2708-2713. [PMID: 27358083 DOI: 10.1021/acs.jpclett.6b01239] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Semiclassical transition-state theory based on fourth-order vibrational perturbation theory (VPT4-SCTST) is applied to compute the barrier transmission coefficient for the symmetric Eckart potential. For a barrier parametrized to mimic the H2 + H exchange reaction, the results obtained are in excellent agreement with exact quantum calculations over a range of energy that extends down to roughly 1% of the barrier height, V0, where tunneling is negligible. The VPT2-SCTST treatment, which is commonly used in chemical kinetics studies, also performs quite well but already shows an error of a few percent at ca. 0.8 V0 where tunneling is still important. This suggests that VPT4-SCTST could offer an improvement over VPT2-SCTST in applications studies. However, the computational effort for VPT4-SCTST treatments of molecules is excessive, and any improvement gained is unlikely to warrant the increased effort. Nevertheless, the treatment of the symmetric Eckart barrier problem here suggests a simple modification of the usual VPT2-SCTST protocol that warrants further investigation.
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Affiliation(s)
- John F Stanton
- Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, The University of Texas at Austin , Austin, Texas 78712, United States
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62
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Greene SM, Shan X, Clary DC. Rate constants of chemical reactions from semiclassical transition state theory in full and one dimension. J Chem Phys 2016; 144:244116. [DOI: 10.1063/1.4954840] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Samuel M. Greene
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Xiao Shan
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - David C. Clary
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
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63
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Meisner J, Kästner J. Reaction rates and kinetic isotope effects of H2 + OH → H2O + H. J Chem Phys 2016; 144:174303. [DOI: 10.1063/1.4948319] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jan Meisner
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Johannes Kästner
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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64
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Greene SM, Shan X, Clary DC. An investigation of one- versus two-dimensional semiclassical transition state theory for H atom abstraction and exchange reactions. J Chem Phys 2016; 144:084113. [DOI: 10.1063/1.4942161] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Samuel M. Greene
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Xiao Shan
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - David C. Clary
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
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65
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The role of torsional motion on the properties of propiolic acid and its H/D isotopic analogs: A density functional study using SCTST and a full anharmonic VPT2 model. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.01.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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66
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Hama T, Kouchi A, Watanabe N. Statistical ortho-to-para ratio of water desorbed from ice at 10 kelvin. Science 2016; 351:65-7. [DOI: 10.1126/science.aad4026] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Tetsuya Hama
- Institute of Low Temperature Science, Hokkaido University, Sapporo 060–0819, Japan
| | - Akira Kouchi
- Institute of Low Temperature Science, Hokkaido University, Sapporo 060–0819, Japan
| | - Naoki Watanabe
- Institute of Low Temperature Science, Hokkaido University, Sapporo 060–0819, Japan
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67
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Greene SM, Shan X, Clary DC. Reduced-Dimensionality Semiclassical Transition State Theory: Application to Hydrogen Atom Abstraction and Exchange Reactions of Hydrocarbons. J Phys Chem A 2015; 119:12015-27. [DOI: 10.1021/acs.jpca.5b04379] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Samuel M. Greene
- Physical and Theoretical Chemistry
Laboratory, Department of Chemistry, University of Oxford, South Parks
Road, Oxford, OX1 3QZ, United Kingdom
| | - Xiao Shan
- Physical and Theoretical Chemistry
Laboratory, Department of Chemistry, University of Oxford, South Parks
Road, Oxford, OX1 3QZ, United Kingdom
| | - David C. Clary
- Physical and Theoretical Chemistry
Laboratory, Department of Chemistry, University of Oxford, South Parks
Road, Oxford, OX1 3QZ, United Kingdom
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68
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Nguyen TL, Lee H, Matthews DA, McCarthy MC, Stanton JF. Stabilization of the Simplest Criegee Intermediate from the Reaction between Ozone and Ethylene: A High-Level Quantum Chemical and Kinetic Analysis of Ozonolysis. J Phys Chem A 2015; 119:5524-33. [DOI: 10.1021/acs.jpca.5b02088] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thanh Lam Nguyen
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Hyunwoo Lee
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Devin A. Matthews
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Michael C. McCarthy
- Harvard-Smithsonian
Center for Astrophysics, 60 Garden
Street, Cambridge, Massachusetts 02138, United States
| | - John F. Stanton
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
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69
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Saheb V. Theoretical studies on the kinetics of hydrogen abstraction reactions of H and CH3 radicals from CH3OCH3 and some of their H/D isotopologues. J Phys Chem A 2015; 119:4711-7. [PMID: 25873440 DOI: 10.1021/acs.jpca.5b00911] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The hydrogen abstraction reactions by H and CH3 radicals from CH3OCH3 and some of their H/D isotopologues are studied by semiclassical transition state theory. Many high-level density functional, ab initio, and combinatory quantum chemical methods, including B3LYP, BB1K, MP2, MP4, CCSD(T), CBS-Q, and G4 methods, are employed to compute the energies and rovibrational properties of the stationary points for the title reactions. Xij vibrational anharmonicity coefficients, used in semiclassical transition state theory, are computed at the B3LYP, BB1K, and MP2 levels of theory. Thermal rate coefficients and kinetic isotope effects are computed over the temperature range from 200 to 2500 K and compared with available experimental data. The computed rate constants for the title reactions are represented as the equation k(T) = ATn exp[−E(T + T0)/(T2 + T02)].
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Affiliation(s)
- Vahid Saheb
- Department of Chemistry, Shahid-Bahonar University of Kerman, Kerman 76169, Iran
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70
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Nguyen TL, Stanton JF. A Steady-State Approximation to the Two-Dimensional Master Equation for Chemical Kinetics Calculations. J Phys Chem A 2015; 119:7627-36. [DOI: 10.1021/acs.jpca.5b00997] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thanh Lam Nguyen
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - John F. Stanton
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
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71
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Vereecken L, Glowacki DR, Pilling MJ. Theoretical Chemical Kinetics in Tropospheric Chemistry: Methodologies and Applications. Chem Rev 2015; 115:4063-114. [DOI: 10.1021/cr500488p] [Citation(s) in RCA: 146] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Luc Vereecken
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | - David R. Glowacki
- PULSE
Institute and Department of Chemistry, Stanford University, Stanford, California 94305, United States
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- School
of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
- Department
of Computer Science, University of Bristol, Bristol BS8 1UB, United Kingdom
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72
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Pilling MJ. Chemical Kinetics. Calculating the pressure dependence of chemical reactions. Science 2014; 346:1183-4. [PMID: 25477442 DOI: 10.1126/science.aaa1257] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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73
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Nguyen TL, McCarthy MC, Stanton JF. Relatively Selective Production of the Simplest Criegee Intermediate in a CH4/O2 Electric Discharge: Kinetic Analysis of a Plausible Mechanism. J Phys Chem A 2014; 119:7197-204. [DOI: 10.1021/jp510554g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thanh Lam Nguyen
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Michael C. McCarthy
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, United States
| | - John F. Stanton
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
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74
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Saheb V, Dayani Yazdi S. Hydrogen abstraction reactions of hydroxyl radicals with 1,1,2,2-tetrachloroethane, 1,1,1,2-tetrachloroethane and pentachloroethane studied by using semi-classical transition state theory. Mol Phys 2014. [DOI: 10.1080/00268976.2014.924632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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75
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Saheb V, Pourhaghighi NY. Theoretical Kinetics Studies on the Reaction of CF3CF═CF2 with Hydroxyl Radical. J Phys Chem A 2014; 118:9941-50. [DOI: 10.1021/jp5055099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Vahid Saheb
- Department of Chemistry, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
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76
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Wagner AF, Dawes R, Continetti RE, Guo H. Theoretical/experimental comparison of deep tunneling decay of quasi-bound H(D)OCO to H(D) + CO2. J Chem Phys 2014; 141:054304. [DOI: 10.1063/1.4891675] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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77
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Nguyen TL, Stanton JF. Accurate ab Initio Thermal Rate Constants for Reaction of O(3P) with H2 and Isotopic Analogues. J Phys Chem A 2014; 118:4918-28. [DOI: 10.1021/jp5037124] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thanh Lam Nguyen
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Texas 78712-0165, United States
| | - John F. Stanton
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Texas 78712-0165, United States
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78
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Klippenstein SJ, Pande VS, Truhlar DG. Chemical Kinetics and Mechanisms of Complex Systems: A Perspective on Recent Theoretical Advances. J Am Chem Soc 2014; 136:528-46. [DOI: 10.1021/ja408723a] [Citation(s) in RCA: 187] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Stephen J. Klippenstein
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Vijay S. Pande
- Department
of Chemistry and Structural Biology, Stanford University, Stanford, California 94305, United States
| | - Donald G. Truhlar
- Department
of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
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79
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Hama T, Watanabe N. Surface Processes on Interstellar Amorphous Solid Water: Adsorption, Diffusion, Tunneling Reactions, and Nuclear-Spin Conversion. Chem Rev 2013; 113:8783-839. [DOI: 10.1021/cr4000978] [Citation(s) in RCA: 211] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tetsuya Hama
- Institute of Low Temperature
Science, Hokkaido University, N19W8 Kita-ku, Sapporo, Hokkaido 060-0819, Japan
| | - Naoki Watanabe
- Institute of Low Temperature
Science, Hokkaido University, N19W8 Kita-ku, Sapporo, Hokkaido 060-0819, Japan
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80
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Experimental and Theoretical Study of the Kinetics and Mechanism of the Reaction of OH Radicals with Dimethyl Ether. J Phys Chem A 2013; 117:11142-54. [DOI: 10.1021/jp4070278] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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81
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Nguyen TL, Stanton JF. Ab Initio Thermal Rate Calculations of HO + HO = O(3P) + H2O Reaction and Isotopologues. J Phys Chem A 2013; 117:2678-86. [DOI: 10.1021/jp312246q] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thanh Lam Nguyen
- Department of Chemistry & Biochemistry, The University of Texas at Austin, Texas 78712-0165, United States
| | - John F. Stanton
- Department of Chemistry & Biochemistry, The University of Texas at Austin, Texas 78712-0165, United States
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82
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Weston RE, Nguyen TL, Stanton JF, Barker JR. HO + CO Reaction Rates and H/D Kinetic Isotope Effects: Master Equation Models with ab Initio SCTST Rate Constants. J Phys Chem A 2013; 117:821-35. [DOI: 10.1021/jp311928w] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ralph E. Weston
- Department
of Chemistry, Brookhaven National Laboratory, Upton, New York 11973,
United States
| | - Thanh Lam Nguyen
- Department
of Chemistry and
Biochemistry, The University of Texas,
Austin, Texas 78712-0165, United States
| | - John F. Stanton
- Department
of Chemistry and
Biochemistry, The University of Texas,
Austin, Texas 78712-0165, United States
| | - John R. Barker
- Department of Atmospheric, Oceanic,
and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
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83
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Takahashi K, Ikeda KS. Instanton and noninstanton tunneling in periodically perturbed barriers: semiclassical and quantum interpretations. Phys Rev E 2012; 86:056206. [PMID: 23214856 DOI: 10.1103/physreve.86.056206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Indexed: 11/07/2022]
Abstract
In multidimensional barrier tunneling, there exist two different types of tunneling mechanisms, instanton-type tunneling and noninstanton tunneling. In this paper we investigate transitions between the two tunneling mechanisms from the semiclassical and quantum viewpoints taking two simple models: a periodically perturbed Eckart barrier for the semiclassical analysis and a periodically perturbed rectangular barrier for the quantum analysis. As a result, similar transitions are observed with change of the perturbation frequency ω for both systems, and we obtain a comprehensive scenario from both semiclassical and quantum viewpoints for them. In the middle range of ω, in which the plateau spectrum is observed, noninstanton tunneling dominates the tunneling process, and the tunneling amplitude takes the maximum value. Noninstanton tunneling explained by stable-unstable manifold guided tunneling (SUMGT) from the semiclassical viewpoint is interpreted as multiphoton-assisted tunneling from the quantum viewpoint. However, in the limit ω→0, instanton-type tunneling takes the place of noninstanton tunneling, and the tunneling amplitude converges on a constant value depending on the perturbation strength. The spectrum localized around the input energy is observed, and there is a scaling law with respect to the width of the spectrum envelope, i.e., the width ∝ℏω. In the limit ω→∞, the tunneling amplitude converges on that of the unperturbed system, i.e., the instanton of the unperturbed system.
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Affiliation(s)
- Kin'ya Takahashi
- The Physics Laboratories, Kyushu Institute of Technology, Kawazu 680-4, Iizuka 820-8502, Japan
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84
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Vasiliou AK, Piech KM, Reed B, Zhang X, Nimlos MR, Ahmed M, Golan A, Kostko O, Osborn DL, David DE, Urness KN, Daily JW, Stanton JF, Ellison GB. Thermal decomposition of CH3CHO studied by matrix infrared spectroscopy and photoionization mass spectroscopy. J Chem Phys 2012; 137:164308. [DOI: 10.1063/1.4759050] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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85
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Kraka E, Zou W, Freindorf M, Cremer D. Energetics and Mechanism of the Hydrogenation of XHn for Group IV to Group VII Elements X. J Chem Theory Comput 2012; 8:4931-43. [DOI: 10.1021/ct300631s] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elfi Kraka
- CATCO Group, Department
of Chemistry, Southern Methodist
University, 3215 Daniel Ave, Dallas, Texas 75275-0314, United States
| | - Wenli Zou
- CATCO Group, Department
of Chemistry, Southern Methodist
University, 3215 Daniel Ave, Dallas, Texas 75275-0314, United States
| | - Marek Freindorf
- CATCO Group, Department
of Chemistry, Southern Methodist
University, 3215 Daniel Ave, Dallas, Texas 75275-0314, United States
| | - Dieter Cremer
- CATCO Group, Department
of Chemistry, Southern Methodist
University, 3215 Daniel Ave, Dallas, Texas 75275-0314, United States
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86
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Tabor DP, Harding ME, Ichino T, Stanton JF. High-Accuracy Extrapolated Ab Initio Thermochemistry of the Vinyl, Allyl, and Vinoxy Radicals. J Phys Chem A 2012; 116:7668-76. [DOI: 10.1021/jp302527n] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel P. Tabor
- Institute for Theoretical Chemistry, Department of
Chemistry and Biochemistry, The University of Texas at Austin, 105 E. 24th St., A5300, Austin, Texas 78712-0165,
United States
| | - Michael E. Harding
- Institute for Theoretical Chemistry, Department of
Chemistry and Biochemistry, The University of Texas at Austin, 105 E. 24th St., A5300, Austin, Texas 78712-0165,
United States
| | - Takatoshi Ichino
- Institute for Theoretical Chemistry, Department of
Chemistry and Biochemistry, The University of Texas at Austin, 105 E. 24th St., A5300, Austin, Texas 78712-0165,
United States
| | - John F. Stanton
- Institute for Theoretical Chemistry, Department of
Chemistry and Biochemistry, The University of Texas at Austin, 105 E. 24th St., A5300, Austin, Texas 78712-0165,
United States
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87
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Nguyen TL, Xue BC, Weston RE, Barker JR, Stanton JF. Reaction of HO with CO: Tunneling Is Indeed Important. J Phys Chem Lett 2012; 3:1549-1553. [PMID: 26285636 DOI: 10.1021/jz300443a] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The potential energy surface and chemical kinetics for the reaction of HO with CO, which is an important process in both combustion and atmospheric chemistry, were computed using high-level ab initio quantum chemistry in conjunction with semiclassical transition state theory under the limiting cases of high and zero pressure. The reaction rate constants calculated from first principles agree extremely well with all available experimental data, which range in temperature over a domain that covers both combustion and terrestrial atmospheric chemistry. The role of quantum tunneling is confirmed to be extremely important, which supports recent work by Continetti and collaborators regarding the loss of hydrogen atoms from vibrationally excited states of HOCO. A sensitivity analysis has been carried out and serves as the basis for a plausible estimate of uncertainty in the calculations.
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Affiliation(s)
| | | | - Ralph E Weston
- ‡Chemistry Department, Brookhaven National Laboratory, Upton, New York 11980, United States
| | - John R Barker
- §Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States
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88
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Barker JR, Nguyen TL, Stanton JF. Kinetic Isotope Effects for Cl + CH4 ⇌ HCl + CH3 Calculated Using ab Initio Semiclassical Transition State Theory. J Phys Chem A 2012; 116:6408-19. [DOI: 10.1021/jp212383u] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- John R. Barker
- Department of Atmospheric,
Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
| | - Thanh Lam Nguyen
- Department of Atmospheric,
Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
| | - John F. Stanton
- Department of Chemistry
and Biochemistry, The University of Texas, Austin, Texas 78712-0165, United States
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