期刊
JOURNAL OF LUMINESCENCE
卷 102, 期 -, 页码 220-225出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-2313(02)00496-9
关键词
photosynthetic light-harvesting; exciton polaron; self-trapped exciton; high-pressure spectroscopy
类别
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.
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