The high frequency dynamics of glassy selenium has been studied by inelastic x-ray scattering at beam line BL35XU (SPring-8). The high quality of the data allows one to pinpoint the existence of a dispersing acoustic mode for wave vectors (Q) of 1.5<Q<12.5 nm^-1, helping to clarify a previous contradiction between experimental and numerical results. The sound velocity shows a positive dispersion, exceeding the hydrodynamic value by ≈10% at Q<3.5 nm^-1. The Q² dependence of the sound attenuation Γ(Q), reported for other glasses, is found to be the low-Q limit of a more general Γ(Q)∝Ω(Q)² law, which applies also to the higher Q region, where Ω(Q)∝Q no longer holds.
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Scopigno et al. (2004) studied this question.
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