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Excited-state dynamics in light-harvesting complex of Rhodobacter sphaeroides

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Chinese Science Bulletin

Abstract

Photodynamics of peripheral antenna complexes, light-harvesting complex (LH2) of Rhodobacter (Rb) Sphaeroides 601, was studied using femtosecond pump-probe technique at different laser wavelengths. The obtained results reveal dramatic dynamical evolutions within B800 and B850 absorption bands of antenna complexes LH2. At excitation wavelength around 835 nm, a sharp photobleaching signal was observed which was assigned to the contribution of the two-exciton state, which was further confirmed by the power dependence measurement. Rate equations with eight-level scheme were used to calculate the population evolution in LH2 and the transient dynamics under femtosecond pulse excitation. The research results prove that not only the transition from ground state to one-exciton state but also that from one-exciton state to two-exciton state contribute to the photodynamics of B850.

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Authors and Affiliations

  1. Physics Department, Fudan University, Shanghai, 200433, China

    KangJun Liu, WeiMin Liu, YongLi Yan, ZhiWei Dong & ShiXiong Qian

  2. National Key Surface Physics Laboratory, Fudan University, Shanghai, 200433, China

    KangJun Liu

  3. Shanghai Institute of Plant Physiology & Ecology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China

    ChunHe Xu

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  1. KangJun Liu
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  2. WeiMin Liu
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  3. YongLi Yan
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  6. ShiXiong Qian
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Correspondence to ShiXiong Qian.

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Supported by the National Natural Science Foundation of China (Grant No. 10674031)

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Liu, K., Liu, W., Yan, Y. et al. Excited-state dynamics in light-harvesting complex of Rhodobacter sphaeroides . Chin. Sci. Bull. 53, 1955–1962 (2008). https://doi.org/10.1007/s11434-008-0187-7

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  • DOI: https://doi.org/10.1007/s11434-008-0187-7

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