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Burning of a narrow spectral hole at 1.7 K in the absorbance band of the primary electron donor of Rhodopseudomonas viridis reaction centers with blocked electron transfer
Author(s) -
Shuvalov V.A.,
Klevanik A.V.,
Ganago A.O.,
Shkuropatov A.Ya.,
Gubanov V.S.
Publication year - 1988
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(88)80171-6
Subject(s) - bacteriochlorophyll , electron acceptor , electron transfer , electron , chemistry , photochemistry , absorbance , electron donor , electron hole , electron transport chain , photosynthetic reaction centre , absorption (acoustics) , absorption band , analytical chemistry (journal) , molecular physics , physics , photosynthesis , optics , catalysis , biochemistry , chromatography , quantum mechanics
Burning of spectral holes within the absorption band of the primary electron donor P in reaction centers of Rhodopseudomonas viridis is studied using selective excitation at 1014 nm and 1.7 K. A narrow (≤ 1.0 cm −1 ) spectral hole with relatively weak electron‐phonon and vibronic coupling is burned if the intermediary electron acceptor I is pre‐reduced. The hole is broadened up to ∼90–150 cm −1 if I is neutral and the electron‐transfer chain is open. Broadening of the hole is discussed in terms of the fast (∼70–110 fs) electron hopping between P* and P + BL − (BL, bacteriochlorophyll monomer in L protein subunit).