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A simple quantum-mechanical calculation has been made to obtain the doublet separations for the parallel type frequencies of the ammonias. The calculated values for the separations are: NH2D (21), NHD2 (11) and ND3 (5.8) cm—1, which compare favorably with observed values: NH2D (20), NHD2 (10) and ND3 (3.4) cm—1.
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Wall et al. (1937) studied this question.
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