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Fluorescence line-narrowing measurements at low temperature were performed on the Fenna−Matthews−Olson complex of Prosthecochloris aestuarii. Superimposed on the phonon wing, several vibronic bands could be observed. By use of these data, the temperature dependence of the lowest-energy absorption band was modeled based on the linear harmonic Franck−Condon approximation. The overall Huang−Rhys factor was estimated to be 0.45. The maximum of the phonon distribution was located at 20 cm-1. Thirty vibrational modes could be observed, and their Franck−Condon factors were estimated. The strongest modes were located at 36, 70, and ∼195 cm-1. For the full width at half-maximum of the inhomogeneous broadening, a value of 80 cm-1 was determined. We did not find any evidence for the presence of different excitonic states in the lowest-energy absorption band.

the journal of physical chemistry b

Electron−Vibrational Coupling in the Fenna−Matthews−Olson Complex of Prosthecochloris aestuarii Determined by Temperature-Dependent Absorption and Fluorescence Line-Narrowing Measurements