Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides |
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| Authors: | V. Nagarajan, R.&#x G. Alden, J.&#x C. Williams, W.&#x W. Parson |
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| Affiliation: | V. Nagarajan, R. G. Alden, J. C. Williams, and 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. |
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