Answers are grounded in this paper and cite their sources.
A vibronic sideband spectrometer has been used to determine the spectral, spatial, and temporal evolution of a phonon distribution propagating in a crystal of SrF₂:Eu²⁺. Spectral and spatial evolution depends strongly on the frequency dependence of phonon scattering at the Eu²⁺ probe ions. The mean free path of phonons in the frequency range of 1-4 THz is found to vary from 10^-3 to 10^-4 mm. The temporal evolution is strongly influenced by anharmonic processes. The effective lifetime for phonons of frequency from 1 to 3 THz is found to be of the order of microseconds.
No takes yet. Share an insight, caveat, or question.
Bron et al. (1977) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: