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.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Bacterial Chromatophores / physiology
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Genes, Bacterial
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Lasers
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Light-Harvesting Protein Complexes
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Photosynthetic Reaction Center Complex Proteins / biosynthesis
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Photosynthetic Reaction Center Complex Proteins / chemistry*
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Rhodobacter sphaeroides / genetics
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Rhodobacter sphaeroides / metabolism*
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Sequence Deletion
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Spectrophotometry, Infrared
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Thermodynamics
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Time Factors
Substances
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Light-Harvesting Protein Complexes
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Photosynthetic Reaction Center Complex Proteins