Excitons and excitation transfer in the photosynthetic unit of purple bacteria

被引：44
|
作者：
Ritz, T
Hu, XC
Damjanovic, A
Schulten, K [1 ]
机构：
[1] Univ Illinois, Beckman Inst, Urbana, IL 61801 USA
[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
来源：
JOURNAL OF LUMINESCENCE | 1998年 / 76-7卷
基金：
美国国家科学基金会; 美国国家卫生研究院;
关键词：
circular aggregates; light-harvesting complexes; photosynthesis;
D O I：
10.1016/S0022-2313(97)00286-X
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Photosynthetic purple bacteria employ an antenna system to absorb sunlight and transfer electronic excitation to a centrally located protein, the photosynthetic reaction center. The antenna system employs for this purpose a hierarchy of circular bacteriochlorophyll aggregates. For the case of a particular light harvesting protein with known structure, one-and two-exciton spectra of its circular bacteriochlorophyll aggregate are determined by means of an effective Hamiltonian description. A detailed geometric model for the complete antenna system of the purple bacterium Rhodobacter sphaeroides is provided by molecular modelling and its bacteriochlorophyll aggregates are investigated, employing also an effective Hamiltonian. Transfer times within the complete antenna system and from the antennae to the reaction center are calculated. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：310 / 321
页数：12
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