Theoretical treatment of reversible energy transfer reactions of metastable reactants: Modification of the integral encounter theory

Corrections to the results of the integral encounter theory (IET) of reversible energy transfer reaction provided by two competing approaches of the modified encounter theory (MET) and the many-particle kernel-theory (MPK-theory) are considered in detail and compared with each other. The present treatment establishes that the MET is more preferable for improving the IET at higher reactant densities. Predictions of the MET and MPK-theory for the quantum yields of luminescence and quenching constants are compared with each other, reversible transfer kinetics from metastable reactant is studied in the framework of the MET.