Femtosecond pump-probe spectroscopy of the B850 antenna complex of Rhodobacter sphaeroides at room temperature

Article Abstract:

The B850 light-harvesting antenna complex of the photosynthetic bacterium Rhodobacter sphaeroides has been examined using femtosecond pump-probe spectroscopy. Excitation of the complex with low-intensity, femtosecond pulses results in changes in absorption and stimulated emission that initially depend on the excitation wavelength but later relax to a quasiequilibrium with a time constant of 100 plus or minus 20 fs. The initial light-induced signals were found to be consistent with coherent excitation of multiple exciton levels in an inhomogeneous ensemble of light-harvesting antenna complexes.

Organic pigments, Bacteria, Photosynthetic, Photosynthetic bacteria, Excited state chemistry, Absorption of light, Light absorption

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Light harvesting by carotenoids incorporated into the B850 light-harvesting complex from rhodobacter sphaeroides r-26: Excited state relaxation, ultrafast triplet formation and energy transfer to bacteriochlorophyll

Article Abstract:

Spirilloxanthin and spheroidene are reconstituted into the carotenoidless B850 light-harvesting complex from the Rhodobacter sphaeroides R-26.1 mutant in order to obtain new insights in energy transfer, triplt formation and other relaxation phenomena in photosynthetic light harvesting.

Science & research, Carotenoids, Photosynthesis

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Femosecond fluorescence depletion anisotropy: application to the B850 antenna complex of Rhodobacter sphaeroides

Article Abstract:

The fluorescence depletion technique is used to measure femtosecond anistropy decays. The photosynthetic bacterium Rhodobacter sphaeroides is used.

Biochemistry, Chemistry, Physical and theoretical, Physical chemistry

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