Dynamics of Excitation Energy Transfer Between the Subunits of Photosystem II Dimer.
Dynamics of Excitation Energy Transfer Between the Subunits of Photosystem II Dimer.
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光系统 II 二聚体亚基之间的激发能量转移动力学。
DOI：
10.1021/jacs.6b04316
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发表时间：
2016
影响因子：
15
通讯作者：
Hiroshi Miyasaka and Yasufumi Umena
中科院分区：
文献类型：
--
作者：
Yusuke Yoneda;Tetsuro Katayama;Yutaka Nagasawa;Hiroshi Miyasaka and Yasufumi Umena
利用飞秒瞬态吸收（TA）光谱研究了光系统II核心复合物（PSII-CC）单体和二聚体中的能量传递动力学。在弱激发强度条件下（≤21 nJ），单体和二聚体的TA动力学没有明显差异。然而，基态漂白剂的快速恢复在较高的激发强度下是明显的，并且二聚体的激发强度依赖性比单体的更显著。这一结果表明，由于两个单体单元之间的能量转移，在二聚体中发生了有效的激子-激子湮灭。基于二项式定理的简单模型再现了湮灭动力学，结果表明PSII-CC二聚体虽然有两个反应中心，但湮灭后只剩下一个电荷分离态.
Energy transfer dynamics in monomer and dimer of the photosystem II core complex (PSII-CC) was investigated by means of femtosecond transient absorption (TA) spectroscopy. There is no profound difference between the TA dynamics of the monomer and the dimer in the weak excitation intensity condition (≤21 nJ). However, the fast recovery of the ground state bleach was pronounced at higher excitation intensities, and the excitation intensity dependence of the dimer was more significant than that of the monomer. This result indicates efficient exciton–exciton annihilation taking place in the dimer due to energy transfer between the two monomer units. The annihilation dynamics was reproduced by a simple model based on binomial theorem, which indicated that although PSII-CC dimer has two reaction centers, only one charge-separated state remained after annihilation.