Multiphonon Absorption in KCl, NaCl, and ZnSe
The frequency and temperature dependence of the absorption coefficient has been measured in NaCl, KCl, and ZnSe using dual beam infrared spectroscopy and tunable CO2 laser calorimetry. The frequency dependent measurements indicate a difference in slope of the log of absorption versus frequency curves between single crystal and the same host hardened by the addition of a small amount of impurities or hot press forged. The temperature dependence of the absorption has been measured from room temperature to near 100K. These measurements extend our earlier high temperature results and thus make possible a more complete comparison between theory and experiment. The results indicate that both an elementary Bose-Einstein treatment and current multiphonon theories are in reasonable agreement with experimental data.
KeywordsZinc Selenide Frequency Dependent Measurement Multiphonon Process Transparent Solid High Purity Single Crystal
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