EXCITON MIGRATION AND TRAPPING IN PHOTOSYNTHESIS
EXCITON MIGRATION AND TRAPPING IN PHOTOSYNTHESIS
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光合作用中的激子迁移和捕获
DOI：
10.1111/j.1751-1097.1982.tb02655.x
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发表时间：
1982
影响因子：
3.3
通讯作者：
R. Pearlstein
中科院分区：
文献类型：
--
作者：
R. Pearlstein
摘要-移动的电子激发态，激子，通过光合生物的天线叶绿素阵列进行随机行走。从通过光子吸收产生激子直到其第一次到达反应中心（RC）的时间间隔被称为随机行走的“第一通过时间”（FPT）。这里提出的激子迁移和捕获的理论预测，激子的寿命，从叶绿素荧光衰减测得的色素或P700复合物，是一个线性函数的分数的量子直接吸收的天线，而不是由RC。这条线的斜率是FPT，其截距是激子的寿命，仅受RC处的光转换限制。这种光转换有限的寿命通过两个参数简单地与原位光转换速率常数相关，每个参数都是实验上可获得的。还可以从作为温度和激发波长的函数的激子寿命的测量中至少近似地获得单个FoUrster速率常数的值。这个新的理论，基于晶格随机游走模型，得到了一些支持，从荧光测量上完成的红球藻R26色素。在目前的形式下，该理论仅适用于单天线组件系统，如Rp。在一些实施方案中，该方法可以用于类球孢菌R26或红杜鹃色素体或P700复合物，但应易于扩展到包括整个叶绿体的多天线组分系统。
Abstract— Mobile electronic excited states, excitons, undergo random walks through the antenna chlorophyll arrays of photosynthetic organisms. The time interval from exciton creation, by photon absorption, until its first arrival at a reaction center (RC) is called the “first passage time” (FPT) of the random walk. A theory of exciton migration and trapping presented here predicts that the exciton lifetime, as measured from chlorophyll fluorescence decay in chromatophores or P700 complexes, is a linear function of the fractional number of quanta absorbed directly by the antenna, not by the RC. The slope of this line is the FPT, and its intercept is the exciton's lifetime as limited only by photoconversion at the RC. This photoconversion‐limited lifetime is simply related to the in situ photoconversion rate constant via two parameters, each of which is experimentally accessible. It is also possible to obtain values of individual FoUrster rate constants, at least approximately, from measurements of exciton lifetime as functions of temperature and excitation wavelength. This new theory, based on lattice random walk models, receives some support from fluorescence measurements done on Rhodopseudomonas sphaeroides R26 chromatophores. In its present form the theory is only applicable to one‐antenna‐component systems, like Rp. sphaeroides R26 or Rhodospirillum rubrum chromatophores or P700 complexes, but should be readily extendible to multi‐antenna‐component systems including whole chloroplasts.
光捕获叶绿素 a/b 蛋白的荧光寿命。
影响因子：
3.4
作者：
Nordlund,TM;Knox,WH
通讯作者：
Knox,WH