ENERGY DISSIPATION OF LOCALIZED EXCITON-VIBRATIONAL SYSTEM

摘要

Time evolution of the excited state energy dissipation of a simple model system consisting of two electronic levels and one harmonic vibrational mode is studied theoretically. The electronic-vibrational interaction is considered to be linear in the vibrational displacement. The vibrational mode is coupled to a thermal bath describing the ambient environment. The kinetic constants for the vibrational dissipation are of the second order in the vibrational-bath coupling and are taken in the Markovian limit (diabatic damping model). Depending on the parameters of the model, different curves of the nonradiative vibration-induced excited state decay are obtained. The presented model for the energy relaxation gives, in the long-time asymptote, higher values of the mean energy than that of the ground state. Applicability of the energy dissipation model is discussed.