OSCILLATOR ANALYSIS OF LIF AND MGO REFLECTIVITY.
Abstract
Classical oscillator theory is applied to the analysis of the fundamental lattice vibration reflectivity spectrum of LiF and MgO in the 200 to 800/cm wave-number range. For each material seven reflectivity curves, ranging from 7.5 to 1060K for LiF and from 8 to 1950K for MgO, are analyzed and the associated dispersion parameters as a function of temperature obtained. The reflectivity curves of both LiF and MgO can be fitted with two resonances at all temperatures. Resonance frequencies nu sub 1 and nu sub 2 are decreasing functions, whereas strengths 4 pi rho sub 1 and 4 pi rho sub 2 are increasing functions of temperature. At the higher temperatures, the width of the main resonance gamma sub 1 obeys a T91.0) power law for LiF and a T(1.5) LAW FOR MgO. In addition, optical constants, real and imaginary parts of the dielectric constant, and absorption coefficients are calculated as functions of wave number and temperature. A description of the classical analysis computer program is included, together with input requirements and FORTRAN IV listings. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0638793
Entities
People
- Alfred Kahan
Organizations
- Air Force Cambridge Research Laboratories