Excited states and electron transfer mechanism in the photosynthetic reaction center of Rhodopseudomonas viridis: SAC–CI study

The symmetry adapted cluster (SAC)–configuration interaction (CI) method has been utilized to assign the excited states in absorption and linear dichroism spectra and to clarify the mechanism of the unidirectionality in the electron transfer of the photosynthetic reaction center of Rhodopseudomonas viridis. We have calculated the ground, excited, ionized, and electron-attached states of all the chromophores in the reaction center. The protein effects were included with the use of the point-charge model.