Abstract
Abstract The attenuation of acoustic phonons in glasses increases with their frequency Ω growing either to internal friction or to scattering by static and dynamical disorder. Friction leads to a finite lifetime, i.e. to homogeneous broadening. Conversely, scattering does not prevent excitations from remaining long-lived, but piane waves become inhomogeneously broadened. In this paper we show that, at very high frequencies Ω ∼ 1THz, acoustic modes enter a regime dominated by strong scattering in which they cease to propagate as piane waves. This is consistent with all available information, whether macroscopic, simulation, or spectroscopic.
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