Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides

V. Nagarajan, R. G. Alden, Joann Williams, W. W. Parson

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Abstract

Spectral changes were measured with femtosecond resolution following low-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacterium Rhodobacter sphaeroides. Absorption anisotropy decays also were measured. We identified a 35-fs relaxation of the absorption and emission spectra of the excited state, as well as a 20- fs anisotropy decay. We interpret these results as interlevel relaxation and dephasing, respectively, of extensively delocalized exciton states of the circular bacteriochlorophyll aggregate.

Original languageEnglish (US)
Pages (from-to)13774-13779
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume93
Issue number24
DOIs
StatePublished - Nov 26 1996

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Rhodobacter sphaeroides
Anisotropy
Photosynthetic Reaction Center Complex Proteins
Bacteriochlorophylls
Proteobacteria
LDS 751

ASJC Scopus subject areas

  • General

Cite this

Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides. / Nagarajan, V.; Alden, R. G.; Williams, Joann; Parson, W. W.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 93, No. 24, 26.11.1996, p. 13774-13779.

Research output: Contribution to journalArticle

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