Temperature Dependence of the Longwavelength Absorption Band of the Reaction Center of Rhodopseudomonas viridis
In a series of previous papers(1,2), we have constructed a vibronic coupling model for the excited states of the chromophores in the reaction center (RC) of photosynthetic bacteria. The model has been used to compute various optical properties (absorption, circular dichroism, polarized absorption, holeburning spectra) of the reaction center pigments; a particular focus has been investigation of the low energy Q y exciton component of the special pair bacteriochlorophylls. Many of the intramolecular vibrational parameters (frequencies, excited state geometry shifts) are obtained a priori from monomer experiments, reducing the parametric flexibility associated with phenomenological lineshape functions. Good agreement with experiment has been obtained by varying a limited set of electronic parameters and by including an intermolecular mode for the special pair dimer P.
KeywordsVibronic Coupling Energy Absorption Band Exciton Component Intermolecular Mode Wavelength Shoulder
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