Ultrafast excitation relaxation dynamics and energy transfer in the siphonaxanthin-containing green alga Codium fragile
Ultrafast excitation relaxation dynamics and energy transfer in the siphonaxanthin-containing green alga Codium fragile
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DOI：
10.1016/j.cplett.2004.03.140
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发表时间：
2004-05-21
影响因子：
2.8
通讯作者：
Mimuro, M
中科院分区：
文献类型：
--
作者：
Akimoto, S;Yamazaki, I;Mimuro, M
利用飞秒时间分辨荧光光谱技术研究了含管黄质的绿色藻--脆松藻（Codium fragile）的超快激发弛豫动力学和能量传递过程。荧光各向异性衰减和荧光寿命清楚地表明，一个有效的Siph到叶绿素（Chl）的能量转移是通过Siph的S，状态的时间常数为400 fs。叶绿素分子之间的能量迁移时间也得到了解决。叶绿体中的Siph在约535 nm处表现出一个新的吸收带，我们提出这源于基于荧光各向异性衰减的S-2和S-1状态之间的一个新的激发态（S-x）。(C)2004 Elsevier B. V.保留所有权利。
Ultrafast excitation relaxation dynamics and energy transfer processes in the siphonaxanthin (Siph)-containing green alga, Codium fragile, were examined using femtosecond time-resolved fluorescence spectroscopy. Fluorescence anisotropy decay and fluorescence lifetimes clearly indicated that an efficient Siph-to-chlorophyll (Chl) a energy transfer was achieved via the S, state of Siph with a time constant of 400 fs. Energy migration times among Chl molecules were also resolved. Siph in the chloroplasts exhibited a new absorption band at approximately 535 nm, and we proposed that this originated from a new excited state (S-x) between the S-2 and S-1 states based on fluorescence anisotropy decay. (C) 2004 Elsevier B.V. All rights reserved.