Abstract
The pressure dependence of the spectral distributions of the glass (i.e. amorphous), orientational glass (OG) and stable (monoclinic) crystal phases of ethanol is investigated by means of neutron inelastic scattering under the same thermodynamic conditions. Parameters characterizing the anharmonic behavior are derived from the measurements and show that the orientationally disordered crystals follow a behavior closer to the true glass than to the ordered crystals. Such a similarity makes the orientationally disrodered cyrstals ideal candidates for quantitatives of the glass transition on a model system where the microscopic dynamics can be accounted in full.
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