Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 139, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4817967
Keywords
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Funding
- (U.S.) Department of Energy (DOE) [DE-FG02-05ER15694]
- National Science Foundation (NSF) [CHE-1300945]
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Extensive high-level ab initio calculations were performed on the ground electronic state of ClH2O. The barrier region for the title reaction was found to have significant multi-reference character, thus favoring the multi-reference configuration interaction (MRCI) method over single-reference methods such as coupled-cluster. A full-dimensional global potential energy surface was developed by fitting about 25 000 MRCI points using the permutation invariant polynomial method. The reaction path features a late barrier flanked by deep pre- and post-barrier wells. Calculated rate constants for the forward reaction are in reasonable agreement with experiment, suggesting a good representation of the forward barrier. The dynamics of the forward reaction was also investigated using a quasi-classical trajectory method at energies just above the barrier. While the OH bond is found to be a spectator, the HCl product has significant rotational excitation. The reaction proceeds via both direct rebound and stripping mechanisms, leading to backward and sideways scattering. (C) 2013 AIP Publishing LLC.
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