Experimental evidence for high frequency transverse-like excitations in glasses

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dc.creatorScopigno, T.
dc.creatorPontecorvo, E.
dc.creatorDi Leonardo, R.
dc.creatorKrisch, M.
dc.creatorMonaco, G.
dc.creatorRuocco, G.
dc.creatorRuzicka, B.
dc.creatorSette, F.
dc.date2002-05-29
dc.date.accessioned2026-07-07T02:45:40Z
dc.date.available2026-07-07T02:45:40Z
dc.descriptionThe 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. Beside the propagating longitudinal excitations modes, at low temperature the spectra show a second non $Q$-dispersing peak at $\hbar Ω_T$$\approx$8.5 meV. We assign this peak to the transverse dynamics that, in topologically disordered systems, acquires a longitudinal symmetry component. This assignment is substantiated by the observation that, in the liquid, this peak vanishes when the structural relaxation time $τ_α$ approaches $Ω_T^{-1}$, a behavior consistent with the condition $τ_αΩ_T^{-1}$$>>$1 required for the existence of a transverse-like dynamics in the liquid state.
dc.description13 pages, 5 PostScript figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0205615
dc.identifierhttp://arxiv.org/abs/cond-mat/0205615
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19381
dc.subjectDisordered Systems and Neural Networks
dc.titleExperimental evidence for high frequency transverse-like excitations in glasses
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