Publication
Intra- and extramolecular vibrations of fulleride surfaces
C. Silien (1), P.A. Thiry (1), and Y. Caudano (1)
Phys. Rev. B, 67 (2003) 075412 (1-6)
Also published in the March 10, 2003 issue of the Virtual Journal of Nanoscale Science & Technology (http://www.vjnano.org)
Abstract
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.
Author addresses
- Laboratoire de Spectroscopie Moléculaire de Surface (LASMOS)
Institute for Studies in Interface Science (ISIS)
Facultés Universitaires Notre-Dame de la Paix (FUNDP)
61 Rue de Bruxelles, B-5000 Namur, Belgium
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