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Energy Transfer Pathways In Reaction Centre Upon Femtosecond Excitation Of Accessory Bacteriochlorophylls

CHINESE PHYSICS LETTERS(2001)

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摘要
The energy transfer pathways from the excited accessory bacteriochlorophylls (B*) within native and modified (pheophytin-exchanged) reaction centres isolated from Rhodobacter sphaeroides (RS601) have been investigated by using the femtosecond pump-probe technique. For native RS601, B* decays with a time constant of 240 fs, followed by a partial recovery of the ground-state bleaching with a timescale of about 2 ps. In modified RS601 (Phe), however, B* decays with a time constant of 800Es for magic angle (54.7 degrees) polarization configuration. In addition to the general assumption of energy transfer pathway from B* to the special pair P, an alternative pathway for energy transfer probably operates as well.
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关键词
energy transfer,time constant,ground state
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