Unraveling exciton relaxation and energy transfer in LH2 photosynthetic antennas

被引：46
作者：
Timpmann, K
Woodbury, NW
Freiberg, A [1 ]
机构：
[1] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA
[2] Arizona State Univ, Ctr Study Early Events Photosynthesis, Tempe, AZ 85287 USA
[3] Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 42期
关键词：
D O I：
10.1021/jp001993q
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：
A long-standing uncertainty has been resolved concerning the early time evolution of light excitations in LH2 antennas of purple photosynthetic bacteria. Both isolated and native membrane-embedded LH2 antenna complexes were comprehensively studied using femtosecond time-resolved transient absorption spectroscopy together with conventional absorption and fluorescence emission spectroscopies at low temperatures. The results show that exciton relaxation within isolated LH2 complexes is characterized by subpicosecond time constants, while spectral evolution associated with energy transfer between the antenna complexes in photosynthetic membranes is characterized by time constants greater than or equal to 1 ps.
引用
收藏
页码：9769 / 9771
页数：3
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