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In order to clarify the origin of the dominant processes responsible for theacoustic attenuation of phonons, which is a much debatted topic, we presentBril louin scattering experiments in various silica glasses of different OHimpurities content. A large temperature range, from 5 to 1500 K isinvestigated, up to the glass transition temperature. Comparison of thehypersonic wave attenuation in various samples allows to identify two differentprocesses. The first one induce s a low temperature peak related torelaxational processes; it is strongly sensitive to the extrinsic defects. Thesecond, dominant in the hig h temperature range, is weakly dependent on theimpurities and can be ascribed to anharmonic interactions

Dynamic sound attenuation at hypersonic frequencies in silica glass