Probability estimate for intersystem crossings in naphthalene and acenaphthene in the presence of benzophenone

To a first approximation in perturbation theory, we have obtained expressions for the rate constants for intersystem crossings in acceptor molecules. We show that exchange interactions between the components of the donor-acceptor pair can change the probability of intersystem crossings for both radiative T → S₀ and nonradiative S₁ → T transitions. The theoretical conclusions are supported by the results of experimental studies. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 4, pp. 550–553, July–August, 2006.