Probing the electronic structure and conformational flexibility of individual light-harvesting 3 complexes by optical single-molecule spectroscopy.


We present fluorescence-excitation spectra of individual light-harvesting 3 (LH3 or B800-820) complexes of Rhodopseudomonas acidophila at 1.2 K. The optical single-molecule studies were employed to investigate the electronic structure as well as the conformational flexibility of the individual pigment-protein complexes. The optical spectra resemble those of… (More)


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