Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides

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

Research output: Contribution to journalArticlepeer-review

104 Scopus citations


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
Issue number24
StatePublished - Nov 26 1996

ASJC Scopus subject areas

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