Abstract
In order to obtain information about the origin of dips observed previously in the x-ray thermal diffuse scattering (TDS) for pyrolytic graphite, phonon frequencies and lifetimes were investigated by neutron inelastic scattering techniques. Although no anomalous dispersion was detected, significant broadening of phonon peaks was found in the region of wave-vector space corresponding to the dips in the TDS. The neutron and x-ray data are discussed on the basis of phonons coupled with an excitation having a two-dimensional dispersion relation. Surface phonons were examined as a possible candidate for such an excitation.
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