Relaxation dynamics of the LH2 complex from a photosynthetic purple bacterium Thiorhodospira sibirica studied by the near-IR femtosecond pump-probe methodстатья

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[1] Relaxation dynamics of the lh2 complex from a photosynthetic purple bacterium thiorhodospira sibirica studied by the near-ir femtosecond pump-probe method / A. P. Razjivin, V. O. Kompanets, R. Y. Pishchal'nikov et al. // Quantum Electronics. — 2005. — Vol. 35, no. 1. — P. 107–110. Photoinduced changes in the absorption spectrum of the LH2 (B800-830-850) complex from a Thiorhodospira sibirica (Trs. sibirica) bacterium are studied by the pump-probe method. The complex has the anomalous absorption spectrum exhibiting three bands in the near-IR region at 793, 826.5, and 846.5 nm. At room temperature, the excitation energy transfer from the B800, B830, and B859 bands was detected with the time constants t(1) (∼ 0.5 ps, t)(2) (∼ 2.5 ps, and t)(3) (of the order of a few hundreds of picoseconds, respectively. A rapid energy transfer from the B830 band compared to energy transfer from the B850 band (t)(2) (t)(3)) suggests that all the three bands belong to the same complex (i.e., that the LH2 complex from Trs. sibirica is homogeneous). A slower energy transfer (by three-five times) from the B830 band of the LH2 complex from Trs. sibirica compared to energy transfer from the B800 band of the LH2 complexes (B800-850 and especially B800-820) from other purple bacteria suggests that the electronic structures of ensembles of bacteriochlorophyll molecules in these complexes are substantially different. [ DOI ]

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