Building on the measured values of two librational frequencies and the tunnelling splitting, the authors determine the rotational potential of the ammonium ion in (NH 4 ) 2 SnCl 6 . Predictions are made concerning the excitations of the deuterated ammonium ion in the same crystal. A comparison with other methods shows a general agreement with respect to the pronounced anharmonicity of the potential.
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Müller et al. (1982) studied this question.
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