Ultrafast dynamics within the B820 subunit from the core (LH-1) antenna complex of Rs-rubrum

被引：60

作者：

Kumble, R ^{[1
]}

Palese, S ^{[1
]}

Visschers, RW ^{[1
]}

Dutton, PL ^{[1
]}

Hochstrasser, RM ^{[1
]}

机构：

[1] UNIV PENN,JOHNSON FDN MOL BIOPHYS,PHILADELPHIA,PA 19104

来源：

CHEMICAL PHYSICS LETTERS | 1996年 / 261卷 / 4-5期

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

LIGHT-HARVESTING COMPLEX; PHOTOSYNTHETIC BACTERIA; RHODOBACTER-SPHAEROIDES; RHODOSPIRILLUM-RUBRUM; EXCITATION TRANSFER; ENERGY-TRANSFER; TI-SAPPHIRE; PUMP-PROBE; FLUORESCENCE; ANISOTROPY;

D O I：

10.1016/0009-2614(96)01021-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：396 / 404

页数：9

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