Quantum Dynamical Description of the Dissipative Energy Transfer in Photosystems. 1. A Model of Interaction between Chromophores and Protein in the Framework of the Redfield Theory
Within the context of the Redfield theory, a model, which describes disssipative dynamics of the excitation energy transfer within native and artificial light-harvesting complexes, is proposed. On basis of the dipole-dipole approximation for interaction between the chromophores and the protein, an analytical expression for the elements of Redfield tensor was obtained, which contains no fitting parameters. This expression takes account of the spatial arrangement of the molecules, their relative orientation and excitation energy, and also implies the dependence of the dissipation rate on the temperature of the protein and its physical properties.