The study of the state [P870 B800] in bacterial reaction centers by selective picosecond and low-temperature spectroscopies |
| |
Authors: | VA Shuvalov AV Klevanik |
| |
Abstract: | 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 PF (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 1P+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 1P+B?] states. |
| |
Keywords: | Selective picosecond spectroscopy Bacterial reaction center Electron transfer Bacteriochlorophyll Bacteriopheophytin |
本文献已被 ScienceDirect 等数据库收录! |