Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 15, Issue 11, Pages S1279-S1290Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/15/11/346
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Spectroscopic results on low-frequency excitations of densified silica are presented and related to characteristic thermal properties of glasses. The end of the longitudinal acoustic branch is marked by a rapid increase of the Brillouin linewidth with the scattering vector. This rapid growth saturates at a crossover frequency Omega(co) which nearly coincides with the centre of the boson peak. The latter is clearly due to additional optic-like excitations related to nearly rigid SiO4 librations as indicated by hyper-Raman scattering. Whether the onset of strong scattering is best described as resulting from hybridization of acoustic modes with these librations, from their elastic scattering (Rayleigh scattering) on the local excitations, or from, soft potentials remains to be established.
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