The study of the state [P870+ B800−] in bacterial reaction centers by selective picosecond and low‐temperature spectroscopies

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Abstract
The selective picosecond excitation of Rhodopseudomonas sphaeroides (R‐26) reaction centers (RCs) at 870 nm induces the formation of the transient state within 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 1P+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 1P and 1[P+B−] states.

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