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Wu Y, Cao J, Bian W. Quantum Dynamics Study of the C( 1D) + HD Reaction on the ã 1A' and b̃ 1A″ Potential Energy Surfaces. J Phys Chem A 2020; 124:801-809. [PMID: 31958231 DOI: 10.1021/acs.jpca.9b09822] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present an in-depth theoretical study of the C(1D) + HD (v = 0, j = 0) → CD (CH) (v', j') + H (D) reaction using a time-dependent wave packet method with full Coriolis coupling on the Zhang-Ma-Bian potential energy surfaces (PESs) recently constructed by our group. The integral cross sections (ICS), differential cross sections, CD/CH branching ratios, and product state distributions are calculated over a wide range of collision energies. We find that the vibrational branching ratio defined as ICS(v'=1)/ICS(v'=0) obtained from the b̃1A″ PES is much smaller than that from the ã1A' PES for both product channels, which may be attributed to the dynamical effects of the conical intersection regulated (CI-R) intermediate on the b̃1A″ PES. The collision energy dependence of CD/CH branching ratios displays oscillatory structures, which may be caused by the resonance states supported by the wells on the PESs. The high-temperature rate coefficients are also obtained and compared with previous results. The role of the excited-state PESs is also discussed.
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Affiliation(s)
- Yanan Wu
- Beijing National Laboratory for Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.,School of Chemical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Jianwei Cao
- Beijing National Laboratory for Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
| | - Wensheng Bian
- Beijing National Laboratory for Molecular Sciences , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.,School of Chemical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , China
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Affiliation(s)
- Jian-wei Cao
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Feng-yi Li
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen-sha Xia
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wen-sheng Bian
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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Ge MH, Yang H, Zheng Y. Theoretical study of product polarization of O(1D) + HCl(v = 0; j = 0) → ClO + H and its isotope exchange reaction. CAN J CHEM 2015. [DOI: 10.1139/cjc-2015-0288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
O(1D) + HCl(v = 0; j = 0) → ClO + H and its isotope exchange reaction O(1D) + DCl(v = 0; j = 0) → ClO + D are studied in the collision energy range 14.0–20.0 kcal/mol based on the potential energy surface 1[Formula: see text] state. Reaction probabilities, integral cross sections, the two angular distribution functions (concerning the initial/final velocity vector, and the product rotational momentum vector), and the product rotational alignment parameters are calculated as a function of the collision energy for the two reactions. The four generalized polarization dependent differential cross sections are presented to manifest the polarization characters. Also, the effect of the collision energy and the kinetic isotope effect are studied.
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Affiliation(s)
- Mei Hua Ge
- School of Physics, Shandong University, Jinan 250100, China
- School of Physics, Shandong University, Jinan 250100, China
| | - Huan Yang
- School of Physics, Shandong University, Jinan 250100, China
- School of Physics, Shandong University, Jinan 250100, China
| | - Yujun Zheng
- School of Physics, Shandong University, Jinan 250100, China
- School of Physics, Shandong University, Jinan 250100, China
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4
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Influence of collision energy on cross section and stereodynamical properties for the reaction H+OCl→OH+Cl. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.05.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Jambrina PG, Montero I, Aoiz FJ, Aldegunde J, Alvariño JM. Elucidation of the O(1D) + HF → F + OH mechanism by means of quasiclassical trajectories. Phys Chem Chem Phys 2012; 14:16338-48. [DOI: 10.1039/c2cp42287e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ge MH, Zheng YJ. Effect of ro-vibrational excitation of HCl on the stereodynamics for the reaction of O(3P)+HCl→OH+Cl. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.10.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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YANG HUAN, HAN KELI, NANBU SHINKOH, BALINT-KURTI GABRIELG, ZHANG HONG, SMITH SEANC, HANKEL MARLIES. INITIAL ROTATIONAL QUANTUM STATE EXCITATION AND ISOTOPIC EFFECTS FOR THE O(1D)+HCl → OH+Cl (OCl+H) REACTION. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633609005209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We present reaction probabilities, branching ratios and vibrational product quantum state distributions for the reaction O (1D)+ HCl → OH+Cl (OCl+H) , Boltzmann averaged over initial rotational quantum states at a temperature of 300 K and also for the deuterium isotopic variant. The quantum scattering dynamics are performed using the potential energy surfaces for all three contributing electronic states. Comparisons are presented with results computed using only the ground electronic state potential energy surface, with results computed using only the j = 0 initial rotational state and also with results obtained using an equal weighting for the lowest 10 rotational states. Inclusion of the higher initial rotational states significantly changes the form of the reaction probability as a function of collision energy, reducing the threshold for reaction on the 1A" and 2A' excited electronic states. We found that the combined inclusion of higher initial rotational states and all three contributing electronic states is crucial for obtaining a branching ratio that is within the range and trend given by experiment from our J = 0 calculations. Isotopic effects range from tunnelling effects for the hydrogen variant and enhancement of reactivity for the production of OD on the excited electronic states.
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Affiliation(s)
- HUAN YANG
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - KE-LI HAN
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - SHINKOH NANBU
- Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan
| | | | - HONG ZHANG
- Centre for Computational Molecular Science, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia
| | - SEAN C. SMITH
- Centre for Computational Molecular Science, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia
| | - MARLIES HANKEL
- Centre for Computational Molecular Science, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia
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BIAN WENSHENG, POIRIER BILL. ACCURATE AND HIGHLY EFFICIENT CALCULATION OF THE O(1D)HCl VIBRATIONAL BOUND STATES, USING A COMBINATION OF METHODS. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633603000768] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Hypochlorous acid, HOCl, is an important intermediate in the O (1D) HCl reactive system. Due in part to a large number of vibrational bound states (over 800), extremely large direct product basis sets (around 300,000) are required to compute the energy levels just below the dissociation threshold. This situation, combined with a very high density of states, results in difficult convergence for iterative methods — e.g. Lanczos requires 50,000 iterations, and filter diagonalization uses 60,000 iterations. In contrast, using new methodologies, we are able to compute the highest-lying bound states with only 271 iterations, although the CPU cost per iteration is substantially greater. Lower lying states are also computed, for a fraction of the CPU cost of the highest energy calculation.
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Affiliation(s)
- WENSHENG BIAN
- Department of Chemistry and Biochemistry, and Department of Physics, Texas Tech University, Box 41061, Lubbock, Texas 79409-1061, USA
| | - BILL POIRIER
- Department of Chemistry and Biochemistry, and Department of Physics, Texas Tech University, Box 41061, Lubbock, Texas 79409-1061, USA
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Ge MH, Zheng YJ. Stereo-dynamics study of O + HCl → OH + Cl reaction on the 3A″, 3A′, and 1A′ states. Theor Chem Acc 2011. [DOI: 10.1007/s00214-011-0917-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bargueño P, Jambrina PG, Alvariño JM, Menéndez M, Verdasco E, Hankel M, Smith SC, Aoiz FJ, González-Lezana T. Energy dependent dynamics of the O(1D) + HCl reaction: A quantum, quasiclassical and statistical study. Phys Chem Chem Phys 2011; 13:8502-14. [DOI: 10.1039/c0cp02619k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kondorskiy A, Nanbu S, Teranishi Y, Nakamura H. Control of Chemical Dynamics by Lasers: Theoretical Considerations. J Phys Chem A 2010; 114:6171-87. [DOI: 10.1021/jp911579h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexey Kondorskiy
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
| | - Shinkoh Nanbu
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
| | - Yoshiaki Teranishi
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
| | - Hiroki Nakamura
- Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8585, Japan
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Bargueño P, Jambrina PG, Alvariño JM, Hernández ML, Aoiz FJ, Menéndez M, Verdasco E, González-Lezana T. The dynamics of the O(1D) + HCl --> OH + Cl reaction at a 0.26 eV collision energy: a comparison between theory and experiment. J Phys Chem A 2010; 113:14237-50. [PMID: 20028155 DOI: 10.1021/jp902336s] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dynamics of the O((1)D) + HCl(v = 0, j = 0) --> Cl + OH reaction at a 0.26 eV collision energy has been investigated by means of a quasiclassical trajectory (QCT) and statistical quantum and quasiclassical methods. State-resolved cross sections and Cl atom velocity distributions have been calculated on two different potential energy surfaces (PESs): the H2 surface (Martinez et al. Phys. Chem. Chem. Phys. 2000, 2, 589) and the latest surface by Peterson, Bowman, and co-workers (PSB2) (J. Chem. Phys. 2000, 113, 6186). The comparison with recent experimental results reveals that the PSB2 PES manages to describe correctly differential cross sections and the velocity distributions of the departing Cl atom. The calculations on the H2 PES seem to overestimate the OH scattering in the forward direction and the fraction of Cl at high recoil velocities. Although the comparison of the corresponding angular distributions is not bad, significant deviations with a statistical description are found, thus ruling out a complex-forming mechanism as the dominant reaction pathway. However, for the ClO + H product channel, the QCT and statistical predictions are found to be in good agreement.
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Affiliation(s)
- P Bargueño
- Departamento de Química Física, Universidad de Salamanca, 37008 Salamanca, Spain
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Yang H, Han KL, Nanbu S, Nakamura H, Balint-Kurti GG, Zhang H, Smith SC, Hankel M. Quantum Mechanical Calculation of Energy Dependence of OCl/OH Product Branching Ratio and Product Quantum State Distributions for the O(1D) + HCl Reaction on All Three Contributing Electronic State Potential Energy Surfaces. J Phys Chem A 2008; 112:7947-60. [DOI: 10.1021/jp803673y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Huan Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Ke-Li Han
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Shinkoh Nanbu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Hiroki Nakamura
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Gabriel G. Balint-Kurti
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Hong Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Sean C. Smith
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
| | - Marlies Hankel
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China, Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, and Centre for Computational Molecular Science, Australian Institute for Bioengineering and
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Zhang H, Hankel M, Smith SC, Nanbu S, Nakamura H. Quantum Calculation of Ro-vibrational States: Methodology and DOCl Application Results. J Phys Chem A 2008; 112:4141-7. [DOI: 10.1021/jp8000114] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hong Zhang
- Centre for Computational Molecular Science, AIBN Building (#75), The University of Queensland, Qld 4072, Brisbane, Australia
| | - Marlies Hankel
- Centre for Computational Molecular Science, AIBN Building (#75), The University of Queensland, Qld 4072, Brisbane, Australia
| | - Sean C. Smith
- Centre for Computational Molecular Science, AIBN Building (#75), The University of Queensland, Qld 4072, Brisbane, Australia
| | - Shinkoh Nanbu
- Research Institute for Information Technology, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Hiroki Nakamura
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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Kohguchi H, Suzuki T, Nanbu S, Ishida T, Mil'nikov GV, Oloyede P, Nakamura H. Collision Energy Dependence of the O(1D) + HCl → OH + Cl(2P) Reaction Studied by Crossed Beam Scattering and Quasiclassical Trajectory Calculations on Ab Initio Potential Energy Surfaces. J Phys Chem A 2008; 112:818-25. [PMID: 18189375 DOI: 10.1021/jp076581x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Shinkoh Nanbu
- Research Institute for Information Technology, Kyusyu University, Hakozaki, Higashiku, Fukuoka 812-8581, Japan
| | - Toshimasa Ishida
- Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-nishihirakicho, Sakyoku, Kyoto 606-8103, Japan
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Yang H, Han KL, Nanbu S, Nakamura H, Balint-Kurti GG, Zhang H, Smith SC, Hankel M. Quantum dynamical study of the O(D1)+HCl reaction employing three electronic state potential energy surfaces. J Chem Phys 2008; 128:014308. [DOI: 10.1063/1.2813414] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kohguchi H, Suzuki T. A Crossed Molecular Beam Imaging Study of the O(1D2)+HCl→OH+Cl(2PJ=3/2, 1/2) Reaction. Chemphyschem 2006; 7:1250-7. [PMID: 16736536 DOI: 10.1002/cphc.200500650] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A crossed molecular beam study is presented for the O((1)D(2))+HCl-->OH+Cl((2)P(J)) reaction at the collision energy of 6 kcal mol(-1). State-resolved doubly differential cross sections are obtained for the Cl((2)P(J=3/2) ) and Cl*((2)P(J=1/2) ) products by velocity-map ion imaging. Both products are slightly more forward scattered, which suggests a reaction mechanism without a long-lived intermediate in the ground electronic state. A small fraction (23 %) of the energy release into the translational degree of freedom indicates strong internal excitation of the counterpart OH radical. The contribution of the electronic excited states of O--HCl to the overall reaction is also examined from the doubly differential cross sections.
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Affiliation(s)
- Hiroshi Kohguchi
- Chemical Dynamics Laboratory, RIKEN, Hirosawa, Wako 351-0198, Japan.
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Zhang H, Smith SC, Nanbu S, Nakamura H. HOCl Ro-Vibrational Bound-State Calculations for Nonzero Total Angular Momentum. J Phys Chem A 2006; 110:5468-74. [PMID: 16623477 DOI: 10.1021/jp058286n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Lanczos homogeneous filter diagonalization method has been employed to compute the HOCl ro-vibrational states for a range of total angular momenta (J = 0, 1, 5, 10, 11, 20, 30) on a newly developed ab initio potential energy surface by Nanbu et al. (J. Theor. Comput. Chem. 2002, 1, 263). For such computationally challenging calculations, a parallel computing strategy has been incorporated into our method to perform the matrix-vector multiplications. For the computed low bound states, a spectroscopic assignment has been made and the widely used approximate adiabatic rotation method has been tested for the broad range of total angular momenta for this deep-well system. Comparison of experimental results with exact quantum mechanical calculations for the selected far-infrared transitions involving the range of total angular momenta has been made possible for the first time.
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Affiliation(s)
- Hong Zhang
- Centre for Computational Molecular Science, Chemistry Building (#68), The University of Queensland, Qld 4072, Brisbane, Australia
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Bian W, Poirier B. Accurate and highly efficient calculation of the highly excited pure OH stretching resonances of O(1D)HCl, using a combination of methods. J Chem Phys 2004; 121:4467-78. [PMID: 15332876 DOI: 10.1063/1.1779577] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Accurate calculation of the energies and widths of the resonances of HOCl--an important intermediate in the O(1D)HCl reactive system--poses a challenging benchmark for computational methods. The need for very large direct product basis sets, combined with an extremely high density of states, results in difficult convergence for iterative methods. A recent calculation of the highly excited OH stretch mode resonances using the filter diagonalization method, for example, required 462,000 basis functions, and 180,000 iterations. In contrast, using a combination of new methods, we are able to compute the same resonance states to higher accuracy with a basis less than half the size, using only a few hundred iterations-although the CPU cost per iteration is substantially greater. Similar performance enhancements are observed for calculations of the high-lying bound states, as reported in a previous paper [J. Theo. Comput. Chem. 2, 583 (2003)].
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Affiliation(s)
- Wensheng Bian
- Department of Chemistry and Biochemistry and Department of Physics, Texas Tech University, Lubbock, Texas 79409-1061, USA
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Kamisaka H, Tolstikhin OI, Nakamura H. Full Quantum Dynamics of Atom−Diatom Chemical Reactions in Hyperspherical Elliptic Coordinates. J Phys Chem A 2004. [DOI: 10.1021/jp049102s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hideyuki Kamisaka
- Department of Functional Molecular Science, School of Mathematical and Physical Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan, and Department of Theoretical Studies, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Oleg I. Tolstikhin
- Department of Functional Molecular Science, School of Mathematical and Physical Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan, and Department of Theoretical Studies, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Hiroki Nakamura
- Department of Functional Molecular Science, School of Mathematical and Physical Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan, and Department of Theoretical Studies, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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