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- W2113178384 abstract "We studied the fluorescence dynamics of the light-harvesting-2 complex of Rhodopseudomonas acidophila both with and without an externally applied electric field. The fluorescence emission spectrum of the complex shows (small) spectral shifts of the average emission wavelength on a time scale of ∼300 ps. The shifts are temperature dependent and result from a combination of the (a) dielectric relaxation, or solvation, of the excited states by the protein, which causes a red shift of the emission, and (b) nonradiative loss processes occurring in a subset of the ensemble of complexes. These two processes compete with delocalization and energy transfer around the ring and are shown to be sensitive to an external electric field. The experiments illustrate how nature has prevented the above-mentioned loss processes in vivo by having fast energy transfer around a symmetric structure. Local protein relaxation is slow for the delocalized (or fast-hopping) excited states. However, once localized, localization and (d..." @default.
- W2113178384 created "2016-06-24" @default.
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- W2113178384 date "2003-02-11" @default.
- W2113178384 modified "2023-09-27" @default.
- W2113178384 title "Direct Observation of Solvation Dynamics and Dielectric Relaxation in the Photosynthetic Light-Harvesting-2 Complex of Rhodopseudomonas acidophila" @default.
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- W2113178384 doi "https://doi.org/10.1021/jp026726u" @default.
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