INFRARED SPECTRA OF INORGANIC DIELECTRIC SOLIDS.
Abstract
The lattice vibration spectrum of a solid has recently been characterized by one single frequency, which is defined as the frequency of the center of gravity of the spectrum, called 'centro-frequency.' Here the experimental determination of this frequency is shown in detail for a number of solids, the vibrational spectra of which became available recently. Emphasis is given to spectral data at various temperatures, from 4K to about 1000K, and at the various major crystallographic directions. The 'centro-frequencies' at room temperature and higher temperatures show almost no change; whereas, at low temperature the 'centrofrequencies' consistently show a very definite increase. The result reveals a definite increase in binding energy with temperature decrease. A considerably higher resolution, particularly in the broad band areas, was obtained with spectra at very low temperatures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1964
- Accession Number
- AD0608785
Entities
People
- Johannes N. Plendl
- Peter J. Gielisse
Organizations
- Air Force Cambridge Research Laboratories