Electron-molecular vibration interactions in undoped fullerene films. A micro-Raman study

Abstract A detailed micro-Raman study of the various crystallites in undoped fullerene films, comprising C 60 with inclusions of other fullerenes, has been carried out. Raman spectra of some of the crystallites exhibited a broad background scattering and a superposed asymmetric band shape for some of the optical phonons. These spectral features are qualitatively similar to those observed in doped fullerenes like K 3 C 60 . In the present case electron transfer from higher fullerenes to C 60 is envisaged to explain the observation.