Vibrational Spectra of Molecules and Complex Ions in Crystals. VIII. The Infrared Spectrum of a Mixed Crystal of 1-Deutero-Ammonia and 2-Deutero-Ammonia

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Abstract
The infrared spectrum of a mixed crystal containing NH3, NH2D, ND2H, and ND3 was observed at —190°C. All of the fundamental frequencies of NH2D and ND2H were assigned. A calculation of the 12 frequencies of these two molecules was made, using the four nonzero force constants previously obtained from NH3 and ND3. The average deviation from the observed frequencies was 0.6 percent and the maximum deviation 1.6 percent. It is shown that the coupling between the motions of the various molecules can be neglected.