THEORETICAL-STUDY OF THE MIGRATION OF ELECTRONIC EXCITATION ALONG THEPOLYMER-CHAINS IN CONFORMATION MOTION

The approach of the effective medium approximation (EMA) has been used for the description of incoherent migration of electronic excitation. The migration takes place among the chromophores linked into a polyme r chain which is in conformational motion. The polynomial equation, co rresponding to two relative positions of neighbouring chromophores, yi elds the hypersurface of the effective rate coefficients W(eff)(z) of the migration, where z is the parameter of the Laplace transformation. The inverse Laplace transformation of functions of W(eff)(z) gives th e mean-square distance and the diffusion coefficient D(t) of the migra tion of excitation. The dependence of D(t) as well as of its limit val ue for long time D(infinity) on the rate of the trans reversible gauch e (T reversible G) conformational motion has been outlined for the pol yvinylnaphthalene (PVN) chain.