DYNAMIC BEHAVIOR OF EXCITONS IN LIGHT-HARVESTING LHC2 COMPLEXES

Based on new experimental data of linear and nonlinear spectroscopic i nvestigations of LHC2 complexes, both the energy transfer and energy r elaxation of excitons were studied in the limiting cases of strong pig ment-pigment and pigment-protein interactions, respectively. Consequen ces of the structural basis and the dominance of strong pigment-pigmen t interactions in monomers were independently established by different optical measurements. In this model, the energy relaxation of exciton s was determined by dynamical processes of exciton interactions with t he radiation field and the long-wave protein vibrations, respectively, in particular with the mode having the wave number of 43 cm(-1).