Abstract
The dynamic structure factor of glassy and liquid glycerol has been measured by inelastic X-ray scattering in the exchanged momentum Q region Q=2–23 nm−1 and in the temperature range 80–570 K. Besides the propagating longitudinal mode, at low temperatures the spectra show a second non-Q-dispersing peak at ≈ 8.5 meV. This peak is the signature of the transverse dynamics which, in topologically disordered systems, acquire a small Q-dependent longitudinal symmetry component. This assignment is substantiated by a study of the temperature dependence of the intensity of the second peak. This study showed that, in the liquid, the second peak intensity vanishes when the structural relaxation time τ α approaches , a behaviour consistent with the condition τα ΩT ≫1 required for the existence of a non-relaxational transverse-like dynamics in the liquid state.
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