NEW CONCEPT OF ENERGY MIGRATION AND TRAPPING IN PURPLE BACTERIA - CHARGE-TRANSFER POLARON MODEL

A new hypothetical concept of the reaction center (RC) and the core BC hl antenna is developed which claims to fit all up to date experimenta l data. In particular, the concept accounts for a number of findings s till waiting for an explanation: a) the ''red'' shifts of the core BCh l absorption peaks relative to those in their corresponding core BChls ; b) the reason why in purple bacteria the second P-2-P800-BPH-Q brunc h of RC is inactive c) recent data /1,2/ on a small excitation portion which escapes from the excited RC Special pair back to antenna BChls; d) why the primary electron donor is not monomer but a pair of /B/Chl s; e) the reason why the fluorescence spectra of the RC special pairs are enormously red-shifted relative to their absorption spectra.