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M. A. ZABOLOTNYI, Yu. M. BARABASH, O. P. DMYTRENKO, M. P. KULISH, Eh. L. MARTYNCHUK, N. I. SOKOLOV, Yu. I. PRYLUTSKIY, and A. P. OLASYUK
«Three-Level Model for Photoinduced Structural Changes in Reaction Centres of Biomolecules»
PACS numbers: 42.50.Wk, 81.07.Nb, 82.30.Fi, 82.39.Jn, 87.15.A-, 87.15.ht, 87.80.Cc
The photoinduced changes are studied in the structure of molecular complex of reactionary centre (RC) of Rhodobacter sphaeroides purple bacteria during intramolecular transfer of electron. As shown, after shutdown of exciting light, the time dependence of speed constant of electron return from acceptor to the donor of RC has S-type shape. The three-level model of electron transport is proposed. The analysis of RC-solution absorption change is performed within the scope of the three-level model. An equation determining the ratio of populations of electronic levels of primary and secondary quinones at illumination of RC is derived. The solution of this equation even for stationary case does not have the Boltzmann character and depends on the intensity of the exciting light.