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Keywords:

  • excitons;
  • light-harvesting complexes;
  • photosynthesis;
  • single-molecule studies
Thumbnail image of graphical abstract

Sequences of high resolution low-temperature emission spectra from individual light-harvesting 2 (LH2) complexes from Rhodopseudomonas acidophila reveal a much larger variety of the emission profiles than previously observed. The results provide direct evidence for substantial variations in electron–phonon coupling and concomitantly of exciton (de)localization within single pigment-protein complexes.