High-Frequency Dynamics in Glassy Selenium Fig. 1. IXS spectra of g-Se (solid circles) for several momentum transfers, indicated by labels in units of nm -1 . The instrument resolution (dotted line) and the best fit lineshape (continuous line) according to the model discussed in the text (corrected for resolution broadening and detailed balance factor) are also indicated. The investigation of short wavelength acoustic modes in glasses has stimulated a sizeable number of studies in the last decades. The reason for such interest lies in the close link between these high- frequency excitations and some well-known anomalies, such as the excess of the vibrational density of state (the so-called Boson Peak) or the thermal conductivity plateau observed in the 1
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