Description of excitation transfer and damping in the primary processes of bio-(chemical) systems

Abstract

A theory of propagation of excitations in finite systems within the Haken-Strobl model is presented. The time dependence of various characteristics of the system with a trap (reaction centre), taken as a sink, was obtained. For large values of the sink rate constant the excitation prefers transfer back and forth inside the effectively decoupled remainder of the system to being trapped at the sink. In the time dependence of the trap luminescence the change from the symmetric form to the asymmetric is observed on passage from the coherent regime of propagation to the incoherent one.