ULTRAFAST EXCITON RELAXATION IN THE B850 ANTENNA COMPLEX OF RHODOBACTER-SPHAEROIDES

Citation
V. Nagarajan et al., ULTRAFAST EXCITON RELAXATION IN THE B850 ANTENNA COMPLEX OF RHODOBACTER-SPHAEROIDES, Proceedings of the National Academy of Sciences of the United Statesof America, 93(24), 1996, pp. 13774-13779
Citations number
22
Categorie Soggetti
Multidisciplinary Sciences
ISSN journal
00278424
Volume
93
Issue
24
Year of publication
1996
Pages
13774 - 13779
Database
ISI
SICI code
0027-8424(1996)93:24<13774:UERITB>2.0.ZU;2-L
Abstract
Spectral changes were measured with femtosecond resolution following l ow-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacterium Rhodobacter sphaeroides. Absorp tion anisotropy decays also were measured, We identified a 35-fs relax ation of the absorption and emission spectra of the excited state, as well as a 20-fs anisotropy decay. We interpret these results as interl evel relaxation and dephasing, respectively, of extensively delocalize d exciton states of the circular bacteriochlorophyll aggregate.