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An ab initio potential surface describing abstraction and exchange for H+CH4

J. Chem. Phys. 124, 021104 (2006); doi:10.1063/1.2162532

Published 11 January 2006

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Xiubin Zhang
Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322

Bastiaan J. Braams
Department of Mathematics and Computer Science, Emory University, Atlanta, Georgia 30322

Joel M. Bowman
Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322
We report an ab initio-based global potential energy surface for H+CH4 that describes the abstraction and exchange reactions. The PES, which is invariant with respect to any permutation of five H atoms, is a fit to 20 728 electronic energies calculated using the partially spin-restricted coupled-cluster method (RCCSD(T)) with a moderately large basis (aug-cc-pVTZ). A first set of quasiclassical trajectory calculations using this PES are reported for the H+CD4-->HD+CD3 reaction at collision energies of 0.65 and 1.52 eV and are compared to experiment and recent direct dynamics calculations done with density functional theory. ©2006 American Institute of Physics
History: Received 21 November 2005; accepted 7 December 2005; published 11 January 2006
Permalink: http://link.aip.org/link/?JCPSA6/124/021104/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.30.Hk
    Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)
  • 82.20.Kh
    Potential energy surfaces for chemical reactions
  • 82.20.Ln
    Semiclassical theory of reactions and/or energy transfer in chemical kinetics
  • 82.30.Cf
    Atom and radical chemical reactions; chain reactions, molecule-molecule reactions
  • YEAR: 2006

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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