EXCITON DYNAMICS IN CIRCULAR AGGREGATES - APPLICATION TO ANTENNA OF PHOTOSYNTHETIC PURPLE BACTERIA

被引:69
作者
NOVODEREZHKIN, VI
RAZJIVIN, AP
机构
[1] MOSCOW MV LOMONOSOV STATE UNIV,AN BELOZERSKY INST PHYSICOCHEM BIOL,DEPT PHOTOSYNTH,MOSCOW 119899,RUSSIA
[2] MOSCOW MV LOMONOSOV STATE UNIV,CTR INT LASER,MOSCOW 119899,RUSSIA
[3] RUSSIAN ACAD SCI,SCI RES CTR TECHNOL LASERS,TROITSK 142092,RUSSIA
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1016/S0006-3495(95)80283-3
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
A theoretical model of exciton dynamics in circular molecular aggregates of tight-harvesting bacteriochlorophyll of photosynthetic bacteria is proposed. The spectra and anisotropy of photoinduced absorption changes in the femto- and picosecond time domain are under its scope. The excited state of aggregate was treated due to the standard exciton theory, taking into account a pigment inhomogeneity. Dephasing processes via the exciton-phonon interactions were described by means of the Haken-Strobl equation. it was shown that only two exciton levels are dipole-allowed in the case of homogeneous circular aggregate. The pigment inhomogeneity results in the appearance of several weak transitions to higher exciton levels. it was proposed that the minor band (B896) in an absorption spectrum of the B875 complex as well as the similar minor band in spectra of B800-850 complex correspond to electron transition from the ground to the lowest exciton level, whereas the major band corresponds to transition to the higher exciton level. The proposed model shows the subpicosecond decay of anisotropy at the short-wavelength side of absorption band and a high degree of anisotropy at the long-wavelength side, even at high temperatures.
引用
收藏
页码:1089 / 1100
页数:12
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