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Simple quantum mechanics and complicated ultrasonic attenuation
Author(s) -
Prohofsky E. W.,
Purdom R. C.
Publication year - 2009
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560050864
Subject(s) - attenuation , ultrasonic attenuation , transverse plane , simple (philosophy) , ultrasonic sensor , phonon , thermal , transverse wave , mechanics , materials science , physics , acoustics , optics , condensed matter physics , structural engineering , thermodynamics , engineering , philosophy , epistemology
The ultrasonic attenuation of Al 2 O 3 along the a axis at low temperatures is explained by taking into account the finite lifetimes of the thermal phonons. The longitudinal attenuation proceeds via unallowed transitions. The slow transverse is normal attenuation. The fast transverse is a mixed case.