Using narrowband excitation to confirm that the S* state in carotenoids is not a vibrationally-excited ground state species

被引：34

作者：

Jailaubekov, Askat E. ^{[1
]}

Song, Sang-Hun ^{[1
]}

Vengris, Mikas ^{[2
]}

Cogdell, Richard J. ^{[3
]}

Larsen, Delmar S. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA

[2] Vilnius Univ, Quantum Elect Dept, Fac Phys, LT-10223 Vilnius, Lithuania

[3] Univ Glasgow, Inst Biomed & Life Sci, Glasgow, Lanark, Scotland

来源：

CHEMICAL PHYSICS LETTERS | 2010年 / 487卷 / 1-3期

基金：

英国生物技术与生命科学研究理事会;

关键词：

TRANS-BETA-CAROTENE; LIGHT-HARVESTING COMPLEXES; GREEN FLUORESCENT PROTEIN; PUMP-DUMP-PROBE; ABSORPTION-SPECTROSCOPY; ULTRAFAST DYNAMICS; RAMAN-SPECTROSCOPY; ENERGY-TRANSFER; SINGLET-STATE; BACTERIOCHLOROPHYLL;

D O I：

10.1016/j.cplett.2010.01.014

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：

The hypothesis that S* is a vibrationally-excited ground-state population is tested and discarded for two carotenoid samples: beta-carotene in solution and rhodopin glucoside embedded in the light harvesting 2 protein from Rhodopseudomonas acidophila. By demonstrating that the transient absorption signals measured in both systems that are induced by broadband (1000 cm (1)) and narrowband (50 cm (1)) excitation pulses are near identical and hence bandwidth independent, the impulsive stimulated Raman scattering mechanism proposed as the primary source for S* generation is discarded. To support this conclusion, previously published multi-pulse pump-dump-probe signals [17] are revisited to discard secondary mechanisms for S* formation. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：101 / 107

页数：7

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