Infrared dielectric properties of cadmium fluoride and lead fluoride

Abstract

Infrared reflectivity measurements have been made on samples of cubic CdF2 and PbF2 between 10 and 150 μ at room temperature. The data have been analyzed by the use of reflectivity dispersion relations to obtain infrared dielectric properties of these substances as well as their optic-mode frequencies (transverse and longitudinal, TO and LO). For CdF2 we find ωTO=202 cm-1; ωLO=384 cm-1; εs=8.09. For PbF2, ωTO=102 cm-1; ωLO=337 cm-1; εs=27.4. © 1965 The American Physical Society.