Quantitative assessment of the vibronic coupling in ${\mathrm{C}}_{60}^{-}$ via doping effects in Raman scattering experiments

Raman scattering and infrared data from experiments performed on doped fullerenes is collated from published work. The resulting information is interpreted in order to extract a measure of the electron-phonon coupling in fullerene systems. A simple model is used to analyze the shifts in the phonon frequencies caused by doping, in which contributions due to charge-transfer effects and vibronic coupling are separated. It is found that the coupling coefficients inferred for the $h_g$ modes of the buckminsterfullerene monoanion ${\mathrm{C}}_{60}^{\mathrm{-}}$ are in good agreement with those deduced from experimental photoemission spectroscopy data.