We report here measurements of the valence band spectra, the C 1s core level spectra and the vibrational excitation spectra of a C60 monolayer (ML) film on Si(111) 7 × 7 and Si(100) 2 × 1 surfaces, using photoelectron spectroscopy and high-resolution electron energy loss spectroscopy (HREELS) in combination with scanning tunneling microscopy. 1 ML films are formed after annealing the 5 ML films at 670 K. The bonding states between C60 molecules and Si substrates are clearly observed at 2.1 eV on both surfaces in the valence band spectra. The shift of binding energies of the molecular orbitals and the C 1s core level spectra indicate the charge transfer. The softening of several vibrational modes is observed on the Si(111) 7 × 7 and Si(100) 2 × 1 surfaces with HREELS. The charge transfer scheme explains the softening well. We discuss the bonding nature in terms of hybridization of C60 molecular orbitals with the surface states.
|出版ステータス||Published - 1999 9 10|
|イベント||Proceedings of the 1998 International Symposium on Surface and Interface: Properties of Different Symmetry Crossing 98 (ISSI PDSC-98) - Tokyo, Jpn|
継続期間: 1998 11 19 → 1998 11 21
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