Theoretical analysis of the quantum contributions to the reactions H/sub 2/(v=1)+H. -->. H + H/sub 2/(v'=0,1) and H/sub 2/(v=1) + D. -->. H + HD(v'=0,1)
- Los Alamos National Lab, NM
Detailed quantum-dynamical calculations on the Siegbahn-Liu-Truhlar-Horowitz (SLTH) surface reported for a rotating linear model (RLM) approximation with and without corrections for bending zero-point energy. These dynamical results predict that there are substantial prethreshold quantum contributions to state-selected cross sections and rate constants for both of the title reactions. However, the mechanisms for these prethreshold quantum effects are not the same. For H/sub 2/(v=1)+H, a threshold resonance is responsible for the large prethreshold quantum contribution: 65% of the total rate of 300K. For H/sub 2/(v=1)+D, tunneling is found to be large, leading to a 66% prethreshold quantum contribution at 300K. These large quantum corrections are not large enough to provide an explanation for the previously identified discrepancy between the experimental and classical theoretical rate constants for these reactions.
- OSTI ID:
- 5720799
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 87:7
- Country of Publication:
- United States
- Language:
- English
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