Abstract
The dynamics of reactions with low internal barriers are studied both analytically and numerically for two different models. Exact expressions for the average rate, k I, are obtained by solving the associated first passage time problems. Both the average rate constant, k I, and the numerically calculated long-time rate constant, k L, show a fractional power law dependence on the barrier height for very low barriers. The crossover of the reaction dynamics from low to high barrier is investigated.
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