We present a method for calculating the one- and two-phonon law S(Q,ω) for models of amorphous solids. The calculation is considerably simplified by explicitly performing the necessary orientation averages. We illustrate use of the method by calculating the one-phonon scattering from long-wavelength acoustic waves in an amorphous solid. In the small-Q region a Brillouin scattering is predicted.
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Carpenter et al. (1975) studied this question.
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