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.
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Axe et al. (1965) studied this question.
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