FS-study on energy relaxation in light-harvesting (LH1) complexes from Rhodospirillum rubrum with carotenoids of different conjugation length

被引：2

作者：

Gaertner, P ^{[1
]}

Port, H

Branschaedel, M

Ghosh, R

机构：

[1] Univ Stuttgart, Inst Phys 3, D-70550 Stuttgart, Germany

[2] Univ Stuttgart, Inst Biol, Dept Biophys, D-70550 Stuttgart, Germany

来源：

JOURNAL OF LUMINESCENCE | 2004年 / 108卷 / 1-4期

关键词：

femtosecond spectroscopy; bacterial light harvesting;

D O I：

10.1016/j.jlumin.2004.01.026

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

This contribution comprises of a comparative fs-spectroscopic study on light-harvesting (LH1) complexes from mutants of Rhodospirillum rubrum. These complexes contain carotenoids of different conjugation lengths (it), Spirilloxanthin (Spx, n = 13) as found in wild-type or tetra-hydro-Spirilloxanthin (thSpx, n = 11), but no reaction center. After selective carotenoid (Car)-excitation we are able to separate the characteristic Car-signals in transient-absorption spectra, which are similar in both cases, but overall blue-shifted for thSpx. Besides the characteristic groundstate absorption bleaching, two excited state absorption components are observed. These are separated by about 1050 cm(-1) and decay on different time scales. From comparison with an LH1 complex lacking Car, direct evidence is given for Car to bacteriochlorophyll energy transfer. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：111 / 116

页数：6

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