Abstract
He atom scattering has been used to study inelastic bound state resonances and the Debye-Waller factor for the basal plane of graphite. The angular location of the resonant structures allows a dispersion curve to be obtained for the phonons involved in the inelastic process; this dispersion curve is very near that pertaining to TA ⊥ transverse acoustic modes of bulk graphite. The attenuation of the specular peak in the surface temperature range from 20 to 300 K is used to derive the mean-square displacement 〈 u 2 ⊥〉 of surface atoms, perpendicular to the (0001) graphite plane. The temperature dependence of 〈 u 2 ⊥〉 cannot be explained by using a simple Debye model. It is shown that this anomalous behaviour is due to the layered structure and strong anisotropy of the crystal and can be explained in terms of the known low-frequency phonon spectrum of graphite.
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