Changes in the dipolar vibrational fingerprint of C60 upon adsorption and K intercalation

Christophe Silien, Yves Caudano, André Peremans, Paul Thiry

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Résumé

The HREELS spectra of a C60 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 C60 LUMO (t1u) occupancy. The evolution of the C60 intramolecular vibrational spectrum upon K intercalation is studied by HREELS and discussed with particular emphasis on the two Ag (Raman active) and four T1u (IR active) modes. Both Ag modes exhibit at the interface dipolar activity explained by electron-phonon coupling. Upon K intercalation, the T1u modes show an evolution similar to what is observed in K- or Rb-doped bulk C60, allowing to identify C60(6-) as the saturated phase.
langue originaleAnglais
Pages (de - à)445-451
Nombre de pages7
journalApplied Surface Science
Volume162-163
étatPublié - 2000

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