Ultrafast dynamics within the B820 subunit from the core (LH-1) antenna complex of Rs-rubrum
Ultrafast dynamics within the B820 subunit from the core (LH-1) antenna complex of Rs-rubrum
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DOI：
10.1016/0009-2614(96)01021-4
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发表时间：
1996-10-25
影响因子：
2.8
通讯作者：
Hochstrasser, RM
中科院分区：
文献类型：
--
作者：
Kumble, R;Palese, S;Hochstrasser, RM
利用魔角和偏振泵浦-探测光谱技术研究了细菌捕光复合物二聚体亚基的飞秒瞬态动力学，在各向同性信号中观察到170 cm（-1）和约20 cm（-1）、50 cm（-1）和115 cm（-1）的振荡。在各向异性中，二聚体激子能级的Stokes位移和退相发生在低于50 fs的时间尺度上，重组聚集体表现出超快的光谱演化和双相各向异性衰减。总的来说，这些结果支持LH-1复合物内的能量迁移的观点，即通过二聚体亚基的状态之间的强烈散射激发转移进行。
Femtosecond transient dynamics within the dimeric subunit of a bacterial light-harvesting complex have been investigated using magic angle and polarized pump-probe spectroscopy, Oscillations of 170 cm(-1) and approximate to 20 cm(-1), 50 cm(-1) and 115 cm(-1) are observed in the isotropic signal. and of approximate to 500 cm(-1) in the anisotropy; the Stokes shift and dephasing of the dimer exciton levels occurs on a sub-50 fs timescale, The re-assembled aggregate exhibits ultrafast spectral evolution and biphasic anisotropy decay. Collectively, the results support a view of energy migration within LH-1 complexes as proceeding by strongly scattered excitation transfer between states of the dimeric subunits.