PHONON INTERACTIONS IN CRYSTALS.
Abstract
A quantitative theory of adiabatic fast passage in S = 1 systems is presented. This theory supports the qualitative arguments previously given to explain the experimental MASER results. The dynamic gain mechanism is shown to be stimulated phonon - photon double quantum emission. The attenuation of 9 Gc/s phonons in phosphorous doped Ge was measured. According to the proposed theory of attenuation caused by bound electrons in degenerate states, the attenuation of the shear wave in the (100) direction should show a maximum at about 20K. The observed attenuation shows a maximum at about 15K, confirming the theory. The implications of this attenuation mechanism for the thermal conductivity of doped Ge and Si are considered. Many observations on the thermal conductivity are explained by the attenuation in degenerate electronic states. Data are presented on the values of the acoustic energy velocity for quartz, sapphire, Na C1 and KI. The experimental values are those obtained from heat pulse propagation studies and are in good agreement with theoretical energy velocity values. The theoretical energy velocity values were determined by a special geometrical construction given by Musgrave and allow the construction of energy velocity surfaces. Values of the velocity are given that agree to within 5% of the observed heat pulse velocities. The multivalued nature of the energy surface is discussed and shown to be in good agreement with the heat pulse experiments. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 14, 1965
- Accession Number
- AD0615960
Entities
People
- M. Pomerantz
- N. S. Shiren
- R. J. Von Gutfeld
Organizations
- IBM Thomas J. Watson Research Center