title: Observation of the onset of strong scattering on high frequency acoustic phonons in densified silica glass.
abstract: The linewidth of longitudinal acoustic waves in densified silica glass is obtained by inelastic x-ray scattering. It increases with a high power alpha of the frequency up to a crossover where the waves experience strong scattering. We find that alpha is at least 4, and probably larger. Resonance and hybridization of acoustic waves with the boson-peak modes seems to be a more likely explanation for these findings than Rayleigh scattering from disorder.
authors.affiliation: Laboratoire des Verres, UMR 5587 CNRS, Université Montpellier 2, F-34095 Montpellier, France.
authors.forename: B
authors.initials: B
authors.lastname: Rufflé
authors.forename: M
authors.initials: M
authors.lastname: Foret
authors.forename: E
authors.initials: E
authors.lastname: Courtens
authors.forename: R
authors.initials: R
authors.lastname: Vacher
authors.forename: G
authors.initials: G
authors.lastname: Monaco