Abstract
The internal vibrations of the ammonium ion in NH4MnF3 and NH4ZnF3 single crystals have been studied with IR and Raman spectroscopies. The Raman spectra of NH4MnF3 and the IR spectra of both compounds have been measured in their two structural phases. The assignment of internal modes has been worked out, clarifying previous unsolved questions. The NH4+ force constants obtained with the GF matrix method are given for the cubic and low temperature phases. Finally, with the formulation of the bond polarizability theory, Raman intensities at the low temperature have been predicted and compared with measurements.
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