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Huang J, Chen J, Liu S, Zhang DH. Time-Dependent Wave Packet Dynamics Calculations of Cross Sections for Ultracold Four-Atom Reactions. J Phys Chem Lett 2020; 11:8560-8564. [PMID: 32972141 DOI: 10.1021/acs.jpclett.0c02606] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report here the first time-dependent wave packet dynamics study for an ultracold four-atom reaction. Our calculations provide accurate integral cross sections and rate constants all the way down to the Bethe-Wigner threshold regime for the benchmark OH + H2(v = 2, j = 0) → H2O + H reaction, indicating that the time-dependent wave packet method is a powerful tool for studying ultracold four-atom reactions.
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Affiliation(s)
- Jiayu Huang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
| | - Shu Liu
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Dong H Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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Abrahamsson E, Groenenboom GC, Krems RV. Spin-orbit relaxation of Cl(P1∕22) and F(P1∕22) in a gas of H2. J Chem Phys 2007; 126:184303. [PMID: 17508799 DOI: 10.1063/1.2732751] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The authors present quantum scattering calculations of rate coefficients for the spin-orbit relaxation of F(2P1/2) atoms in a gas of H2 molecules and Cl(2P1/2) atoms in a gas of H2 and D2 molecules. Their calculation of the thermally averaged rate coefficient for the electronic relaxation of chlorine in H2 agrees very well with an experimental measurement at room temperature. It is found that the spin-orbit relaxation of chlorine atoms in collisions with hydrogen molecules in the rotationally excited state j=2 is dominated by the near-resonant electronic-to-rotational energy transfer accompanied by rotational excitation of the molecules. The rate of the spin-orbit relaxation in collisions with D2 molecules increases to a great extent with the rotational excitation of the molecules. They have found that the H2/D2 isotope effect in the relaxation of Cl(2P1/2) is very sensitive to temperature due to the significant role of molecular rotations in the nonadiabatic transitions. Their calculation yields a rate ratio of 10 for the electronic relaxation in H2 and D2 at room temperature, in qualitative agreement with the experimental measurement of the isotope ratio of about 5. The isotope effect becomes less significant at higher temperatures.
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Affiliation(s)
- Erik Abrahamsson
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z3 Canada
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Grinev TA, Tscherbul TV, Buchachenko AA, Cavalli S, Aquilanti V. Interactions of 2P Atoms with Closed-Shell Diatomic Molecules: Alternative Diabatic Representations for the Electronic Anisotropy. J Phys Chem A 2006; 110:5458-63. [PMID: 16623475 DOI: 10.1021/jp056143v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The matrices of electrostatic and spin-orbit Hamiltonians for the system of a 2P atom interacting with a closed shell diatomic molecule in uncoupled, coupled, and complex-valued representations for electronic diabatic basis functions are rederived, and the unitary transformations connecting them are given explicitly. The links to previous derivations are established and existing inconsistencies are identified and eliminated. It is proven that the block-diagonalization of a 6 x 6 matrix of the electronic Hamiltonian is a result of using the basis functions with well-defined properties with respect to time reversal. Consideration of time-reversal symmetry also enforces phase consistency relevant for applications to multisurface reactive scattering and photodetachment spectroscopy calculations, as well as for perspective studies of inelastic effects in cold and ultracold environments. These and further developments are briefly sketched.
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Affiliation(s)
- Timur A Grinev
- Laboratory of Molecular Structure and Quantum Mechanics, Department of Chemistry, Moscow State University, 119992 Moscow, Russia
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Pirani F, Maciel GS, Cappelletti D, Aquilanti V. Experimental benchmarks and phenomenology of interatomic forces: open-shell and electronic anisotropy effects. INT REV PHYS CHEM 2006. [DOI: 10.1080/01442350600674033] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Rusin LY, Sevryuk MB, Toennies JP. Comparison of experimental time-of-flight spectra of the HF products from the F+H2 reaction with exact quantum mechanical calculations. J Chem Phys 2005; 122:134314. [PMID: 15847472 DOI: 10.1063/1.1873772] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
High resolution HF product time-of-flight spectra measured for the reactive scattering of F atoms from n-H2(p-H2) molecules at collision energies between 69 and 81 meV are compared with exact coupled-channel quantum mechanical calculations based on the Stark-Werner ab initio ground state potential energy surface. Excellent agreement between the experimental and computed rotational distributions is found for the HF product vibrational states v'=1 and v'=2. For the v'=3 vibrational state the agreement, however, is less satisfactory, especially for the reaction with p-H2. The results for v'=1 and v'=2 confirm that the reaction dynamics for these product states is accurately described by the ground electronic state 1 (2)A' potential energy surface. The deviations for HF(v'=3, j' > or =2) are attributed to an enhancement of the reaction resulting from the 25% fraction of excited ((2)P(12)) fluorine atoms in the reactant beam.
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Affiliation(s)
- Lev Yu Rusin
- Institute of Energy Problems of Chemical Physics, Russia Academy of Sciences, Leninskiî prospect 38, Building 2, Moscow 119334, Russia.
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Baer M, Vértesi T, Halász GJ, Vibók Á. Electronic Diabatic Framework: Restrictions Due to Quantization of the Nonadiabatic Coupling Matrix. J Phys Chem A 2004. [DOI: 10.1021/jp0487051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Baer
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
| | - T. Vértesi
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
| | - G. J. Halász
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
| | - Á. Vibók
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
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Gonzalez-Lezana T, Rackham EJ, Manolopoulos DE. Quantum reactive scattering with a transmission-free absorbing potential. J Chem Phys 2004; 120:2247-54. [PMID: 15268364 DOI: 10.1063/1.1637584] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
A recently derived transmission-free absorbing potential is applied to the study of atom-diatom chemical reactions. This absorbing potential only depends on a single parameter--the width of the absorbing region--and its reflection properties are guaranteed to improve as this parameter is increased. Converged results can therefore be obtained very easily, as we illustrate with time-dependent wave packet calculations on the H + H2,F + H2, and H + O2 reactions.
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Affiliation(s)
- Tomas Gonzalez-Lezana
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
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Zhang Y, Xie TX, Han KL, Zhang JZH. Time-dependent quantum wave packet calculation for nonadiabatic F(2P3/2,2P1/2)+H2 reaction. J Chem Phys 2003. [DOI: 10.1063/1.1626537] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Balakrishnan N, Dalgarno A. On the Isotope Effect in F + HD Reaction at Ultracold Temperatures. J Phys Chem A 2003. [DOI: 10.1021/jp022654v] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- N. Balakrishnan
- Department of Chemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, Nevada 89154
| | - A. Dalgarno
- Institute for Theoretical Atomic and Molecular Physics, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138
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Balakrishnan N, Groenenboom GC, Krems RV, Dalgarno A. The He–CaH([sup 2]Σ[sup +]) interaction. II. Collisions at cold and ultracold temperatures. J Chem Phys 2003. [DOI: 10.1063/1.1562947] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Xie TX, Zhang Y, Zhao MY, Han KL. Calculations of the F + HD reaction on three potential energy surfaces. Phys Chem Chem Phys 2003. [DOI: 10.1039/b300763d] [Citation(s) in RCA: 166] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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