Mechanism of charge separation and their stabilization in bacterial reaction centers |
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Authors: | Iakovlev A G Vasil'eva L G Shkuropatov A Ia Bolgarina T I Shkuropatova V A Dolgova T A Shuvalov V A |
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Affiliation: | Department of Photobiophysics, Belozerskii Research Institute, Moscow State University, Vorob'evy Gory, 119992 Russia. |
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Abstract: | The nuclear wavepacket formed by 20-fs excitation on the P* potential energy surface in native and mutant (YM210W and YM210L) reaction centers of Rhodobacter (Rb.) sphaeroides and Chloroflexus (C.) aurantiacus RCs was found to be reversibly transferred to the P+BA- surface at 120, 380, and 640-fs delays (monitored by measurements of BA- absorption at 1020-1028 nm). The reaction centers of YM210W(L) mutant show the most simple pattern of fs oscillations with a period of 230 fs in stimulated emission from P* and in the product P+BA-. The mechanisms of the electron transfer pathway between P* and BA and of the stabilization of the state P+BA- in bacterial reaction centers are discussed. |
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