Delocalization of excitations in disordered media with dipole transfer

The migration of excitations over a system of impurity centers due to dipole-dipole interactions is studied. A numerical and analytical study of the probability of finding an excitation on the center of its primary localization is carried out for the main models describing the kinetics of spin systems and systems of localized excitons. The results obtained are characterized by a uniformly high accuracy over the entire range of times available for experimental investigations. It is revealed that the preasymptotic effects are in qualitative agreement with theoretical predictions but are quantitatively twice as large as those.