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The room-temperature transmittance of KMgF₃ and MgF₂ have been measured from 800 to 70 cm^-1. Reflectance measurements were made over a wider range in the far infrared and the data have been analyzed using the Kramers-Kronig relationship to obtain the dielectric dispersion of these materials. Three resonances were observed for KMgF₃ and four were observed for MgF₂ as required by standard group theory and these have been related to presumed normal modes of vibration of the crystals.
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Hunt et al. (1964) studied this question.
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