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The internal vibrations of the ammonium ion in NH 4 MnF 3 and NH 4 ZnF 3 single crystals have been studied with IR and Raman spectroscopies. The Raman spectra of NH 4 MnF 3 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...
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