The observation of spectral and spatial diffusion of phonons in an Al₂{O}₃$ crystal containing both inelastic and resonance-elastic scattering centers (two different species of impurity ions) is reported. Phonons were generated by pulsed far-infrared excitation at a fixed frequency and monitored by time-resolved detection at a different frequency. Analysis of the data leads to the determination of the basic parameters of spectral and spatial diffusion.
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Happek et al. (1985) studied this question.
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