Intra- and extramolecular vibrations of fulleride surfaces

Christophe Silien, Paul Thiry, Yves Caudano

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The surfaces of K-doped C60 thin films have been studied by high-resolution electron energy loss spectroscopy in reflection geometry. In addition to showing the expected intramolecular infrared-active modes of T1u symmetry, as well as their usual behavior upon doping, the K4C60 and K6C60 phases display two K-related, dipole-active, extramolecular phonons. In K3C60, the electronic screening limits the dipolar probing depth to the topmost layer and only one K-related phonon is observed. Our data also reveal that the Raman-active Ag vibrations dominate the intramolecular energy region. The properties and the modified K/C60 stoichiometry of the outmost surfaces of fullerides are discussed accordingly.
langue originaleAnglais
journalPhysical Review B
Volume67
étatPublié - 2003

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