光合系统中激发态的非线性湮灭
Nonlinear annihilation of excitations in photosynthetic systems.
作者信息
Valkunas L, Trinkunas G, Liuolia V, van Grondelle R
机构信息
Institute of Physics, Vilnius, Lithuania.
出版信息
Biophys J. 1995 Sep;69(3):1117-29. doi: 10.1016/S0006-3495(95)79986-6.
Abstract
The theory of the singlet-singlet annihilation in quasi-homogeneous photosynthetic antenna systems is developed further. In the new model, the following important contributions are taken into account: 1) the finite excitation pulse duration, 2) the occupation of higher excited states during the annihilation, 3) excitation correlation effects, and 4) the effect of local heating. The main emphasis is concentrated on the analysis of pump-probe kinetic measurements demonstrating the first two above possible contributions. The difference with the results obtained from low-intensity fluorescence kinetic measurements is highlighted. The experimental data with picosecond time resolution obtained for the photosynthetic bacterium Rhodospirillum rubrum at room temperature are discussed on the basis of this theory.
摘要
准均匀光合天线系统中的单重态-单重态湮灭理论得到了进一步发展。在新模型中，考虑了以下重要因素：1）有限的激发脉冲持续时间；2）湮灭过程中较高激发态的占据情况；3）激发关联效应；4）局部加热效应。主要重点集中在对泵浦-探测动力学测量的分析上，这些测量证明了上述前两种可能的因素。突出了与低强度荧光动力学测量结果的差异。基于该理论，讨论了在室温下对光合细菌红螺菌获得的具有皮秒时间分辨率的实验数据。
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