Reversible energy transfer integral encounter theory

This is a clear demonstration that a differential encounter theory is not a reasonable alternative to an integral one, when the energy transfer is reversible and occurs between the unstable reactants. Since the lifetimes are not equal, the rate constant of the energy transfer from the short-lived to the long-lived particle does not exist (diverges) at long times. In contrast, in integral formalism we do not encounter any difficulties. This is illustrated by the simplest example of contact transfer considered below. 

We have seen in Section IV that the study of the reversible reaction of energy transfer was made possible only by means of integral encounter theory. The same is true for reversible electron transfer (3.354) that was first considered with IET in Ref. 188 and then in a much wider context in subsequent publications [107,189],... 

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See also in sourсe #XX -- [ , , ]

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