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VOLUME 42 (1985) | ISSUE 11 | PAGE 458
Propagation and relaxation of rf acoustic phonons in thin crystal plates
A phonon spectrometer with high spatial and temporal resolution has been used to study the propagation and relaxation of rf acoustic phonons in thin anthracene crystals. The nature of the propagation of the nonequilibrium phonons changes at a time ~ 40 ns after the excitation pulse.