We have investigated vibrational modes of C60 monolayer film adsorbed on the Si(111)7 × 7 surface using high-resolution electron-energy-loss spectroscopy in combination with scanning tunneling microscopy. The differences in energies and in oscillator strengths from a thick C60 film (i.e., bulk C60) are discussed in terms of the charge transfer from silicon dangling bonds to C60 molecules. The amount of charge transfer is estimated to be 1 ± 1 electron(s) compared with the infrared absorption spectra of alkaline-doped C60 fullerides and with the weak electron- molecular-vibration coupling calculation.
ASJC Scopus subject areas
- Physics and Astronomy(all)