Abstract
Atom-exchange and dissociation reaction cross sections, angular distributions, and product-energy distributions have been computed for the Kr+NeAr, Kr+Ar2, and Xe+Ar2 van der Waals reactions using Monte Carlo quasiclassical trajectories. Angular and product-energy distributions were also computed for the Ar+ArKr atom-exchange reactions. Detailed collision mechanisms are suggested to explain the cross section ratios for the atom-exchange branching for the two reactions. The trajectory results indicate that the branching ratio is the result of a competition between statistical factors, which tend to favor the more exothermic pathway, and mechanistic factors which tend to favor abstraction of the lighter atom of the reactant diatom through a stripping mechanism.
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