Results have been obtained which indicate that a necessary condition for the phenomenological rate equation Eq. (1) to hold in dissociationmdash;recombination of diatomic molecules A2is that the concentration of Atoms A be sufficiently small. It is estimated that this condition is met for values of the atom concentration which have been obtained experimentally and that it would continue to be met for values of the atom concentration which are larger than the experimental values by several orders of magnitude.
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