Self-trapped excitons in LH2 bacteriochlorophyll-protein complexes under high pressure

被引：10

作者：

Timpmann, K

Ellervee, A

Kuznetsov, A

Laisaar, A

Trinkunas, G

Freiberg, A

机构：

[1] Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia

[2] Inst Phys, LT-2600 Vilnius, Lithuania

来源：

JOURNAL OF LUMINESCENCE | 2003年 / 102卷

关键词：

photosynthetic light-harvesting; exciton polaron; self-trapped exciton; high-pressure spectroscopy;

D O I：

10.1016/S0022-2313(02)00496-9

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The absorption and emission spectra of excitons in LH2 antenna complexes from the photosynthetic purple bacterium Rhodobacter sphaeroides have been studied under hydrostatic pressure. The measurements made between ambient pressure and 6 kbar over a broad temperature range reveal largely different rates of the pressure-induced shifts for the absorption and emission bands. Numerical calculations based on exciton polaron model provide evidence for the exciton self-trapping at ambient pressure as well as for the pressure stabilization of the self-trapped exciton states responsible for the emission, whereas the light absorbing states belong to nearly free excitons over the whole pressure and temperature ranges studied. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：220 / 225

页数：6

共 14 条

[1]

DAVYDOV FAD, 1971, THEORY MOL EXCITONS

[2] SPECTRAL HOLE BURNING AT HIGH HYDROSTATIC-PRESSURE [J].