Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides.
basic_science · Level V
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- Record sourced from PubMed, PMID 8943011.
- Also identified by PMC identifier 19422.
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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.
Medical subject headings
- Photosynthetic Reaction Center Complex Proteins
- Rhodobacter sphaeroides