Photoemission Spectra ofC60−: Electron-Phonon Coupling, Jahn-Teller Effect, and Superconductivity in the Fullerides

A high resolution experimental photoemission spectrum of ${\mathrm{C}}_{60}^{-}$ is compared with calculations including the Jahn-Teller effect and multiple phonon satellites. The spectra show discrete loss features due to the excitation of phonons. From the intensity of these features, electron-phonon coupling constants are derived, which support the electron-phonon mechanism for superconductivity. The systematic deviations from previously calculated coupling constants are discussed in detail.