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VOLUME 34 (1981) | ISSUE 5 | PAGE 259
Inelastic collision of terahertz.acoustic phonons in ruby crystals
An inelastic interaction of a focused beam of 0.87-THz transverse ballistic phonons with higher frequency (ω> 2 THz) phonons has been observed in a ruby at Τ = 1.8 К by means of a technique for the optical detection of nonequilibrium acoustic phonons.