1
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Chen W, Xie H, Chen Z, Qu Z, Ren H, Li X. Influence of Singlet Oxygen in H + O 2 Collision Reaction. J Phys Chem A 2024; 128:7226-7234. [PMID: 39140992 DOI: 10.1021/acs.jpca.4c03317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
The collision reaction of H + O2 = OH + O is a pivotal step in combustion. To investigate the influence of singlet oxygen on this reaction, we computed potential energy surfaces (PESs) for all six lowest states using high-level ab initio methods and coupled them with embedded atom neural network (EANN) fitting. By integrating quasi-classical trajectory (QCT) with trajectory surface hopping (TSH) based on the fitted PESs, we simulated the dynamics of both ground- and excited-states to derive the reaction rate constants for the forward and reverse processes. The results reveal that the forward reaction facilitates radical generation, promoting combustion reactions. Furthermore, calculations of reverse reaction rate constants indicate that all electronic states ultimately yield ground-state oxygen, leading to radical deactivation and exerting an inhibitory effect on combustion processes.
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Affiliation(s)
- Wenlan Chen
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Haohan Xie
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Zhizhou Chen
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Zexing Qu
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Haisheng Ren
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu 610065, China
| | - Xiangyuan Li
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu 610065, China
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2
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Wang J, An F, Chen J, Hu X, Guo H, Xie D. Accurate Full-Dimensional Global Diabatic Potential Energy Matrix for the Two Lowest-Lying Electronic States of the H + O 2 ↔ HO + O Reaction. J Chem Theory Comput 2023; 19:2929-2938. [PMID: 37161259 DOI: 10.1021/acs.jctc.3c00291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A new and more accurate diabatic potential energy matrix (DPEM) is developed for the two lowest-lying electronic states of HO2, covering both the strong interaction region and reaction asymptotes. The ab initio calculations were performed at the Davidson corrected multireference configuration interaction level with the augmented correlation-consistent polarized valence quintuple-zeta basis set (MRCI+Q/AV5Z). The accuracy of the electronic structure calculations is validated by excellent agreement with the experimental HO2 equilibrium geometry, fundamental vibrational frequencies, and H + O2 ↔ OH + O reaction energy. Through the combination of an electronic angular momentum-method and a configuration interaction vector-based method, the mixing angle between the first two 2A″ states of HO2 was successfully determined. Elements of the 2×2 DPEM were fit to neural networks with a proper account of the complete nuclear permutation inversion symmetry of HO2. The DPEM correctly predicted the properties of conical intersection seams at linear and T-shape geometries, thus providing a reliable platform for studying both the spectroscopy of HO2 and the nonadiabatic dynamics for the H + O2 ↔ OH + O reaction.
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Affiliation(s)
- Junyan Wang
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Feng An
- Research Center for Graph Computing, Zhejiang Lab, Hangzhou 311121, China
| | - Junjie Chen
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xixi Hu
- Kuang Yaming Honors School, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210023, China
- Hefei National Laboratory, Hefei 230088, China
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Daiqian Xie
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
- Hefei National Laboratory, Hefei 230088, China
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3
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Wang CH, Masunov AE, Allison TC, Chang S, Lim C, Jin Y, Vasu SS. Molecular Dynamics of Combustion Reactions in Supercritical Carbon Dioxide. 6. Computational Kinetics of Reactions between Hydrogen Atom and Oxygen Molecule H + O 2 ⇌ HO + O and H + O 2 ⇌ HO 2. J Phys Chem A 2019; 123:10772-10781. [PMID: 31820644 DOI: 10.1021/acs.jpca.9b08789] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reactions of the hydrogen atom and the oxygen molecule are among the most important ones in the hydrogen and hydrocarbon oxidation mechanisms, including combustion in a supercritical CO2 (sCO2) environment, known as oxy-combustion or the Allam cycle. Development of these energy technologies requires understanding of chemical kinetics of H + O2 ⇌ HO + O and H + O2 ⇌ HO2 in high pressures and concentrations of CO2. Here, we combine quantum treatment of the reaction system by the transition state theory with classical molecular dynamics simulation and the multistate empirical valence bonding method to treat environmental effects. Potential of mean force in the sCO2 solvent at various temperatures 1000-2000 K and pressures 100-400 atm was obtained. The reaction rate for H + O2 ⇌ HO + O was found to be pressure-independent and described by the extended Arrhenius equation 4.23 × 10-7 T-0.73 exp(-21 855.2 cal/mol/RT) cm3/molecule/s, while the reaction rate H + O2 ⇌ HO2 is pressure-dependent and can be expressed as 5.22 × 10-2 T-2.86 exp(-7247.4 cal/mol/RT) cm3/molecule/s at 300 atm.
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Affiliation(s)
- Chun-Hung Wang
- NanoScience Technology Center , University of Central Florida , 12424 Research Parkway , Orlando , Florida 32826 , United States
| | - Artëm E Masunov
- NanoScience Technology Center , University of Central Florida , 12424 Research Parkway , Orlando , Florida 32826 , United States.,School of Modeling, Simulation, and Training , University of Central Florida , 3100 Technology Parkway , Orlando , Florida 32816 , United States.,Department of Chemistry , University of Central Florida , 4111 Libra Drive , Orlando , Florida 32816 , United States.,South Ural State University , Lenin pr. 76 , Chelyabinsk 454080 , Russia.,National Research Nuclear University MEPhI , Kashirskoye shosse 31 , Moscow 115409 , Russia
| | - Timothy C Allison
- Southwest Research Institute , San Antonio , Texas 78238 , United States
| | - Sungho Chang
- KEPCO Research Institute , Daejeon 34050 , Korea
| | - Chansun Lim
- Hanwha Power Systems , Seongnam , Gyeonggi 13488 , Korea
| | - Yuin Jin
- Hanwha Power Systems , Seongnam , Gyeonggi 13488 , Korea
| | - Subith S Vasu
- Center for Advanced Turbomachinery and Energy Research (CATER), Mechanical and Aerospace Engineering , University of Central Florida , Orlando , Florida 32816 , United States
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4
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Activation of the electronic excitation state of reactions in the complex region using microwave irradiation. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.04.029] [Citation(s) in RCA: 3] [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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5
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Han S, Zheng X, Ndengué S, Song Y, Dawes R, Xie D, Zhang J, Guo H. Dynamical interference in the vibronic bond breaking reaction of HCO. SCIENCE ADVANCES 2019; 5:eaau0582. [PMID: 30613767 PMCID: PMC6314872 DOI: 10.1126/sciadv.aau0582] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 11/26/2018] [Indexed: 06/09/2023]
Abstract
First-principles treatments of quantum molecular reaction dynamics have reached the level of quantitative accuracy even in cases with strong non-Born-Oppenheimer effects. This achievement permits the interpretation of puzzling experimental phenomena related to dynamics governed by multiple coupled potential energy surfaces. We present a combined experimental and theoretical study of the photodissociation of formyl radical (HCO). Oscillations observed in the distribution of product states are found to arise from the interference of matter waves-a manifestation analogous to Young's double-slit experiment.
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Affiliation(s)
- Shanyu Han
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Xianfeng Zheng
- Anhui Province Key Laboratory of Optoelectric Materials Science and Technology, Department of Physics, Anhui Normal University, Wuhu, Anhui 241000, China
- Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA
| | - Steve Ndengué
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA
| | - Yu Song
- Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA
| | - Daiqian Xie
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
- Synergetic Innovation Center of Quantum Information & Quantum Physics (CAS), University of Science and Technology of China, Hefei, Anhui 230026, China
- State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical Computational Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jingsong Zhang
- Department of Chemistry, University of California, Riverside, Riverside, CA 92521, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA
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6
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Ndengué S, Dawes R, Gatti F, Guo H. Influence of Renner–Teller Coupling between Electronic States on H + CO Inelastic Scattering. J Phys Chem A 2018; 122:6381-6390. [DOI: 10.1021/acs.jpca.8b05235] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steve Ndengué
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Fabien Gatti
- Institut des Sciences Moléculaires d’Orsay, CNRS, Université Paris-Sud/Paris Saclay, F-91405 Orsay, France
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
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7
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Zuo JX, Hu XX, Xie DQ. Quantum Dynamics of Oxyhydrogen Complex-Forming Reactions for the HO2 and HO3 Systems. CHINESE J CHEM PHYS 2018. [DOI: 10.1063/1674-0068/31/cjcp1804060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Jun-xiang Zuo
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Xi-xi Hu
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Dai-qian Xie
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
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8
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Dawes R, Ndengué SA. Single- and multireference electronic structure calculations for constructing potential energy surfaces. INT REV PHYS CHEM 2016. [DOI: 10.1080/0144235x.2016.1195102] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Ndengué SA, Dawes R, Guo H. A new set of potential energy surfaces for HCO: Influence of Renner-Teller coupling on the bound and resonance vibrational states. J Chem Phys 2016; 144:244301. [DOI: 10.1063/1.4954374] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Steve Alexandre Ndengué
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
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10
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Szabó P, Lendvay G. Dynamics of Complex-Forming Bimolecular Reactions: A Comparative Theoretical Study of the Reactions of H Atoms with O2((3)Σg(-)) and O2((1)Δg). J Phys Chem A 2015; 119:12485-97. [PMID: 26517427 DOI: 10.1021/acs.jpca.5b07938] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The atomic-level mechanism of the reaction of H atoms with triplet and singlet molecular oxygen, H((2)S) + O2((3)Σg(-)) → O((3)P) + OH((2)Πg) ( R1 ) and H((2)S) + O2((1)Δg) → O((3)P) + OH((2)Πg) ( R2 ) is analyzed in terms of the topology of the potential energy surfaces (PES) of the two reactions. Both PES exhibit a deep potential well corresponding to the ground and first excited electronic state of HO2. The ground-state reaction is endothermic with no barrier on either side of the well; the excited-state reaction is exothermic with a barrier in the entrance valley of the PES. The differences of the PES are manifested in properties such as the excitation functions, which show reaction R1 to be much slower and the effect of rotational excitation on reactivity, which speeds up reaction R1 and has little effect on R2 . Numerous common dynamics features arise from the presence of the deep potential well on the PES. Such are the significant role of isomerization (for example, 90% of reactive collisions in R2 involve at least one H atom transfer from one of the O atoms to the other in reaction R2 ), which is shown to give rise to a significant rotational excitation of the product OH radicals. Common is the significant sideways scattering of the products that originates from collisions in propeller-type arrangements induced by the presence of two bands of acceptance around the O2 molecule. The HO2 complex in both reactions proves to behave nonstatistically, with signatures of the dynamics in lifetime distributions, angular distributions, opacity functions, and product quantum-state distributions.
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Affiliation(s)
- Péter Szabó
- Department of General and Inorganic Chemistry, Institute of Chemistry, University of Pannonia , P.O.B. 158, Veszprém H-8201, Hungary
| | - György Lendvay
- Department of General and Inorganic Chemistry, Institute of Chemistry, University of Pannonia , P.O.B. 158, Veszprém H-8201, Hungary.,Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences , Magyar Tudósok krt. 2., Budapest H-1117, Hungary
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11
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12
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Copan AV, Schaefer HF, Agarwal J. Examining the ground and first excited states of methyl peroxy radical with high-level coupled-cluster theory. Mol Phys 2015. [DOI: 10.1080/00268976.2015.1063729] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Szabó P, Lendvay G. A Quasiclassical Trajectory Study of the Reaction of H Atoms with O2(1Δg). J Phys Chem A 2015; 119:7180-9. [DOI: 10.1021/jp510202r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Péter Szabó
- Department
of General and Inorganic Chemistry, Institute of Chemistry, University of Pannonia, P.O.B. 158, Veszprém H-8201, Hungary
| | - György Lendvay
- Department
of General and Inorganic Chemistry, Institute of Chemistry, University of Pannonia, P.O.B. 158, Veszprém H-8201, Hungary
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Hungarian Academy of Sciences, Magyar Tudósok krt. 2., Budapest H-1117, Hungary
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14
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Copan AV, Wiens AE, Nowara EM, Schaefer HF, Agarwal J. Peroxyacetyl radical: Electronic excitation energies, fundamental vibrational frequencies, and symmetry breaking in the first excited state. J Chem Phys 2015; 142:054303. [DOI: 10.1063/1.4906490] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Andreas V. Copan
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Avery E. Wiens
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Ewa M. Nowara
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Jay Agarwal
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
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15
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Elliott SN, Turney JM, Schaefer HF. The cis- and trans-formylperoxy radical: fundamental vibrational frequencies and relative energies of the X̃ 2A′′ and à 2A′ states. RSC Adv 2015. [DOI: 10.1039/c5ra22177c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Acylperoxy radicals [RC(O)OO˙] play an important catalytic role in many atmospheric and combustion reactions.
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Affiliation(s)
- Sarah N. Elliott
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Justin M. Turney
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
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16
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Maergoiz AI, Nikitin EE, Troe J. Electronic nonadiabatic effects in low temperature radical-radical reactions. I. C(3P) + OH(2Π). J Chem Phys 2014; 141:044302. [PMID: 25084905 DOI: 10.1063/1.4889996] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The formation of collision complexes, as a first step towards reaction, in collisions between two open-electronic shell radicals is treated within an adiabatic channel approach. Adiabatic channel potentials are constructed on the basis of asymptotic electrostatic, induction, dispersion, and exchange interactions, accounting for spin-orbit coupling within the multitude of electronic states arising from the separated reactants. Suitable coupling schemes (such as rotational + electronic) are designed to secure maximum adiabaticity of the channels. The reaction between C((3)P) and OH((2)Π) is treated as a representative example. The results show that the low temperature association rate coefficients in general cannot be represented by results obtained with a single (generally the lowest) potential energy surface of the adduct, asymptotically reaching the lowest fine-structure states of the reactants, and a factor accounting for the thermal population of the latter states. Instead, the influence of non-Born-Oppenheimer couplings within the multitude of electronic states arising during the encounter markedly increases the capture rates. This effect extends up to temperatures of several hundred K.
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Affiliation(s)
- A I Maergoiz
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, Göttingen D-37077, Germany
| | - E E Nikitin
- Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, Göttingen D-37077, Germany
| | - J Troe
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, Göttingen D-37077, Germany
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17
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Jasper AW, Dawes R. Non-Born–Oppenheimer molecular dynamics of the spin-forbidden reaction O(3P) + CO(X 1Σ+) → CO2(X̃Σg+1). J Chem Phys 2013; 139:154313. [DOI: 10.1063/1.4825204] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Perry JW, Dawes R, Wagner AF, Thompson DL. A classical trajectory study of the intramolecular dynamics, isomerization, and unimolecular dissociation of HO2. J Chem Phys 2013; 139:084319. [PMID: 24007009 DOI: 10.1063/1.4818879] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The classical dynamics and rates of isomerization and dissociation of HO2 have been studied using two potential energy surfaces (PESs) based on interpolative fittings of ab initio data: An interpolative moving least-squares (IMLS) surface [A. Li, D. Xie, R. Dawes, A. W. Jasper, J. Ma, and H. Guo, J. Chem. Phys. 133, 144306 (2010)] and the cubic-spline-fitted PES reported by Xu, Xie, Zhang, Lin, and Guo (XXZLG) [J. Chem. Phys. 127, 024304 (2007)]. Both PESs are based on similar, though not identical, internally contracted multi-reference configuration interaction with Davidson correction (icMRCI+Q) electronic structure calculations; the IMLS PES includes complete basis set (CBS) extrapolation. The coordinate range of the IMLS PES is limited to non-reactive processes. Surfaces-of-section show similar generally regular phase space structures for the IMLS and XXZLG PESs with increasing energy. The intramolecular vibrational energy redistribution (IVR) at energies above and below the threshold of isomerization is slow, especially for O-O stretch excitations, consistent with the regularity in the surfaces-of-section. The slow IVR rates lead to mode-specific effects that are prominent for isomerization (on both the IMLS and XXZLG) and modest for unimolecular dissociation to H + O2 (accessible only on the XXZLG PES). Even with statistical distributions of initial energy, slow IVR rates result in double exponential decay for isomerization, with the slower rate correlated with slow IVR rates for O-O vibrational excitation. The IVR and isomerization rates computed for the IMLS and XXZLG PESs are quantitatively, but not qualitatively, different from one another with the largest differences ascribed to the ~2 kcal/mol difference in the isomerization barrier heights. The IMLS and XXZLG results are compared with those obtained using the global, semi-empirical double-many-body expansion DMBE-IV PES [M. R. Pastrana, L. A. M. Quintales, J. Brandão, and A. J. C. Varandas, J. Chem. Phys. 94, 8073 (1990)], for which the surfaces-of-section display more irregular phase space structure, much faster IVR rates, and significantly less mode-specific effects in isomerization and unimolecular dissociation. The calculated IVR results for all three PESs are reasonably well represented by an analytic, coupled three-mode energy transfer model.
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Affiliation(s)
- Jamin W Perry
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA
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19
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Sharipov AS, Starik AM. Theoretical Study of the Reaction of Ethane with Oxygen Molecules in the Ground Triplet and Singlet Delta States. J Phys Chem A 2012; 116:8444-54. [DOI: 10.1021/jp304906u] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Alexander S Sharipov
- Scientific Educational Centre Physical-Chemical Kinetics and Combustion, Central Institute of Aviation Motors, Moscow, Russia
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21
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Starik A, Sharipov A. Theoretical analysis of reaction kinetics with singlet oxygen molecules. Phys Chem Chem Phys 2011; 13:16424-36. [PMID: 21845271 DOI: 10.1039/c1cp21269a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A comparative analysis of predictive ability of three approaches to estimate the rate constants of reactions of H(2), H, H(2)O and CH(4) with electronically excited O(2)(a(1)Δ(g)) and O(2)(b(1)Σ(g)(+)) molecules is conducted. The first approach is based on a detailed ab initio study of potential energy surfaces. The second one is known as the "bond energy-bond order" method, and the third approach is a modification of the updated method of vibronic terms that makes it possible to evaluate the activation energy of reactions involving electronically excited species. The comparison showed that the estimates of the energy barrier by the updated method of vibronic terms for some reactions can be in good agreement with ab initio calculations and available experimental data. It was revealed that reactions of O(2)(b(1)Σ(g)(+)) molecules with H(2), H(2)O and CH(4) molecules and with the H atom result in the formation of electronically excited species. The reactivity of O(2)(b(1)Σ(g)(+)) molecules is smaller than that of O(2)(a(1)Δ(g)) ones, but much higher as compared to the reactivity of ground state O(2) molecules. For each reaction under study involving oxygen molecules in the excited electronic states O(2)(a(1)Δ(g)) and O(2)(b(1)Σ(g)(+)) the recommended temperature-dependent rate constants are presented.
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Affiliation(s)
- Alexander Starik
- Central Institute of Aviation Motors, 2, Aviamotornaya St., 111116 Moscow, Russia.
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22
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Ma J, Guo H, Xie C, Li A, Xie D. State-to-state quantum dynamics of the H(2S) + O2(ã1Δg) → O(3P)+OH(X̃2Π) reaction on the first excited state of HO2(Ã2A′). Phys Chem Chem Phys 2011; 13:8407-13. [DOI: 10.1039/c0cp02116d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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