Abstract
The HREELS spectra of a C 60 monolayer deposited on Ag(111) show evidences for a strong chemical bonding with the Ag substrate, accompanied by a charge transfer of about 1 electron per adsorbed molecule. K atom intercalation in the adsorbed layer allows an easy tuning of the C 60 LUMO (t 1u) occupancy. The evolution of the C 60 intramolecular vibrational spectrum upon K intercalation is studied by HREELS and discussed with particular emphasis on the two A g (Raman active) and four T 1u (IR active) modes. Both A g modes exhibit at the interface dipolar activity explained by electron–phonon coupling. Upon K intercalation, the T 1u modes show an evolution similar to what is observed in K- or Rb-doped bulk C 60, allowing to identify C 60 6− as the saturated phase.
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