Absorption Coefficient of Alkaline Earth Halides.
Interim rept. 1 May 79-30 Apr 80,
THERMOPHYSICAL AND ELECTRONIC PROPERTIES INFORMATION ANALYSIS CENTER LAFAYETTE IN
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Experimental data on the absorption coefficients of alkaline earth halides were searched, compiled, and analyzed. It was found that the bulk of available data were concentrated to the absorption edges of the main transparent region and were for the four materials CaF2, SrF2, BaF2, and MgF2. An equation was formulated to best describe the absorption data in the infrared multiphonon region as a function of both frequency and temperature. Constants in the equation were determined based on data fitting and correlation. It was noted that the same type of equation is equally valid for both alkaline earth halides and alkali halides. Although the intrinsic absorption can be predicted by the proposed equation, discrepancies may occur in the region where absorption is extremely low and where extrinsic absorptions due to impurities and surfaces contamination dominate the intrinsic absorption by factors ranging from fractions to multiples of ten. Experience has shown that extrinsic contributions can be reduced through improved crystal growing and surface polishing techniques. Author
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy