中国物理B ›› 2003, Vol. 12 ›› Issue (10): 1096-1104.doi: 10.1088/1009-1963/12/10/309

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Excitonic level structures of LH1 and LH2 of purple photosynthetic bacteria using an analytical approach

杨光参, 汪力, 杨国桢   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2003-04-04 修回日期:2003-04-25 出版日期:2005-03-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the Ministry of Science and Technology of China (Grant No G1998010102), and the National Natural Science Foundation of China (Grant No 39890390).

Excitonic level structures of LH1 and LH2 of purple photosynthetic bacteria using an analytical approach

Yang Guang-Can (杨光参), Wang Li (汪力), Yang Guo-Zhen (杨国桢)   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-04-04 Revised:2003-04-25 Online:2005-03-16 Published:2005-03-16
  • Supported by:
    Project supported by the Ministry of Science and Technology of China (Grant No G1998010102), and the National Natural Science Foundation of China (Grant No 39890390).

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摘要： The excitonic level structure of a ring-like chain of dimers is discussed analytically in order to aid the understanding of the possible spectral properties of LH1 and LH2 of purple photosynthetic bacteria. Under the approximation of dipole－dipole interaction between Bchls, the excitonic levels, bandwidths and energy gap between two Davydov subbands are expressed analytically in terms of interaction energies and configurational parameters of dipoles. Our model includes all the interactions between pigment molecules in the system. The oscillator strengths and circular dichroism (CD) for the excitonic states are also presented analytically. The simulated absorption and CD spectra of LH1 and LH2 complexes reproduce the main features of the measured results.

Abstract: The excitonic level structure of a ring-like chain of dimers is discussed analytically in order to aid the understanding of the possible spectral properties of LH1 and LH2 of purple photosynthetic bacteria. Under the approximation of dipole－dipole interaction between Bchls, the excitonic levels, bandwidths and energy gap between two Davydov subbands are expressed analytically in terms of interaction energies and configurational parameters of dipoles. Our model includes all the interactions between pigment molecules in the system. The oscillator strengths and circular dichroism (CD) for the excitonic states are also presented analytically. The simulated absorption and CD spectra of LH1 and LH2 complexes reproduce the main features of the measured results.

Key words: excitonic level, photosynthesis, LH1, LH2

中图分类号:  (Spectra of biomolecules)

  • 87.15.M-
33.70.Jg (Line and band widths, shapes, and shifts) 33.70.Ca (Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors)