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We report Ultraviolet Brillouin light scattering experimental data on v-SiO2in an unexplored frequency region, performed with a newly availablespectrometer up to exchanged wavevector q values of 0.075 nm^{-1}, as afunction of temperature. The measured attenuation scales on visible datafollowing a q^2 behavior and is temperature-dependent. Such temperaturedependence is found in a good agreement with that measured at lower q,suggesting that its origin is mainly due to a dynamic attenuation mechanism.The comparison between the present data with those obtained by Inelastic X-rayScattering suggests the existence of a cross-over to a different attenuationregimes.

physical review b

Sound attenuation in a unexplored frequency region: Brillouin ultraviolet light scattering measurements in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>v</mml:mi><mml:mtext>−</mml:mtext><mml:mi mathvariant="normal">Si</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Sound attenuation in a unexplored frequency region: Brillouin ultraviolet light scattering measurements inv−SiO2