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The study of the state [P870 + B800 − ] in bacterial reaction centers by selective picosecond and low‐temperature spectroscopies
Author(s) -
Shuvalov V.A.,
Klevanik A.V.
Publication year - 1983
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(83)80934-x
Subject(s) - excitation , picosecond , triplet state , chemistry , singlet state , ultrafast laser spectroscopy , photochemistry , atomic physics , analytical chemistry (journal) , spectroscopy , physics , excited state , optics , laser , quantum mechanics , chromatography
The selective picosecond excitation of Rhodopseudomonas sphaeroides (R‐26) reaction centers (RCs) at 870 nm induces the formation of the transient state within <1 ps followed by the conversion into the state P F (P ± Bph ±− during 7 ± 2 ps at both 293 K and 110 K. The transient state including the intense bleaching at 800 nm has been shown not to be due: (a) to photon excitation at 870 nm; (b) the excitation of P + ; (c) photoselection effects. The transient state is interpreted as the state 1 [P + B − ] in agreement with earlier works. The primary formation of the state 1 P + B − ] and the big effective singlet‐triplet splitting in this state correspond to the spectral splitting of the P band at 900 nm in R‐26 RCs and at 1000 nm in Rhodopseudomonas viridis RCs found at 4.2 K and attributed to the optical transition to both 1 P and 1 [P + B − ] states.