Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane

Giacomo Baldi, Paola Benassi, Aldo Fontana, Andrea Giugni, Giulio Monaco, Michele Nardone, Flavio Rossi

Research output: Contribution to journalArticlepeer-review

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Abstract

We report a compared analysis of inelastic X ray scattering (IXS) and of low frequency Raman data of glassy 3-methylpentane. The IXS spectra have been analysed allowing for the existence of two distinct excitations at each scattering wavevector obtaining a consistent interpretation of the spectra. In particular, this procedure allows us to interpret the linewidth of the modes in terms of a simple model which relates them to the width of the first sharp diffraction peak in the static structure factor. In this model, the width of the modes arises from the blurring of the dispersion curves which increases approaching the boundary of the first pseudo-Brillouin zone. The position of the boson peak contribution to the density of vibrational states derived from the Raman scattering measurements is in agreement with the interpretation of the two excitations in terms of a longitudinal mode and a transverse mode, the latter being a result of the mixed character of the transverse modes away from the center of the pseudo-Brillouin zone.
Original languageEnglish (US)
Pages (from-to)164501
JournalThe Journal of Chemical Physics
Volume147
Issue number16
DOIs
StatePublished - Oct 24 2017

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