Abstract
Energy distribution functions for the products in two classes of three-atom unimolecular reactions performed in beam experiments are derived which are much more realistic than the prior distribution functions (PDF) of Levine and Bernstein without being more complicated. In a first step, we deal with light-atom emission processes governed by short-range forces. Contrary to what is generally believed, we emphasize the applicability of statistical theory of energy distributions to such reactions in which the change in energy partitioning from critical configuration to products is weak if not negligible. In a second step, we treat within the framework of phase space theory (PST) the more usual case of processes governed by long-range forces for which, however, there exists no realistic distribution functions. Comparison with experimental results or with results of simulations and/or results obtained using PDF, PST, or the statistical adiabatic channel model (SACM) is done for the following processes: (i) C2H ...
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