紫细菌Rb.Sphaeroides601外周捕光天线(LH2) B800吸收带的超快动力学研究  

Observation of ultrafast excited-state dynamical evolution in B800 absorption band of light harvesting 2 (LH2) extracted from Rb. Sphaeroides 601

作　　者：刘伟民[1] 刘源[2] 徐春和[2] 钱士雄[1] 

机构地区：[1]复旦大学物理系,上海200433 [2]中国科学院植物生态生理研究所,上海200032

出　　处：《物理学报》2006年第9期4472-4477,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10274013)资助的课题.~~

摘　　要：利用从紫细菌Rb.sphaeroides601所提取出的外周捕光天线LH2以及其不同pH值酸化样品(部分和全部去除B800分子LH2)并采用不同波长下的飞秒单色抽运探测技术详细研究了LH2中B800吸收带内的激发态动力学过程。通过对野生型与部分/完全去B800分子LH2的比较研究,分析了B800吸收带激发后所表现出的丰富变化的动力学过程,研究结果表明激发B800带的动力学过程中包含着B850上激子带的直接激发而产生的对激发态动力学的贡献。Photodynamics of two kinds of peripheral antenna complexes light harvesting 2 （LH2） of Rb. Sphaeroides 601, namely the native LH2 and B800-released LH2, where B800-BChls were partially or completely removed with different pH treatments, were studied using femtosecond pump-probe technique at different laser wavelengths. The obtained results for these samples demonstrate that under the excitation around B800 absorption band, the photoabsorption and photobleaching dynamics are caused by the direct excitation of upper excitonic levels of B850 and excited state of B800 pigments, respectively.

关 键 词：紫细菌外周捕光天线LH2 部分和全部去除B800分子LH2 激发态动力学的演变 飞秒抽运探测 

分 类 号：Q631[生物学—生物物理学]