Numéro
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
Page(s) C6-801 - C6-803
DOI https://doi.org/10.1051/jphyscol:19816235
International Conference on Phonon Physics

J. Phys. Colloques 42 (1981) C6-801-C6-803

DOI: 10.1051/jphyscol:19816235

GRAPHITE SURFACE PHONONS STUDIED THROUGH He ATOMS RESONANT SCATTERING

P. Cantini, G. Boato et R. Tatarek

Istituto di Scienze Fisiche dell'Università di Genova, Viale Benedetto XV, 5 - 16132 Genova, Italy


Abstract
He atom scattering has been used to study phonon-assisted bound state resonances and the Debye-Waller factor for the basal plane of graphite. A dispersion relation is reported for the surface phonons involved in the resonances. The attenuation of the specular peak in the temperature range from 20 to 315 K is used to derive the mean-square displacement <u21> of surface atoms, perpendicular to the (0001) plane. The anomalous thermal behaviour of <u21> is explained by considering the layered structure of the crystal.