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Spectral diffusion of the lowest exciton component in the core complex from Rhodopseudomonas palustris studied by single-molecule spectroscopy |
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| Authors: | Martin F. Richter Jürgen Baier June Southall Richard J. Cogdell Silke Oellerich Jürgen Köhler |
| Affiliation: | (1) Experimental Physics IV and Bayreuth Institute of Macromolecular Research (BIMF), University of Bayreuth, 95440 Bayreuth, Germany;(2) Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Biomedical Research Building, 120 University Place, Glasgow, G12 8TA, UK |
| Abstract: | We have recorded fluorescence-excitation spectra from individual RC–LH1 complexes from Rhodopseudomonas palustris. The spectra feature a few broad bands accompanied by a sharp line at the low-energy side of the spectrum which is ascribed to the lowest exciton state of the BChl a assembly. Recording several fluorescence-excitation spectra from the same individual complex in rapid succession reveals that the linewidth of the lowest exciton transition is determined by spectral diffusion which increases for higher excitation energies. |
| Keywords: | Bacterial photosynthesis Light-harvesting complex Single-molecule spectroscopy Spectral diffusion Purple bacteria |
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