Abstract
The infrared stretching and bending frequencies of isotopically dilute +NHD3 ions in predominantly +ND4 salts have been measured at pressures up to 5 GPa at 25°C. For most of the 28 salts studied, the stretching bands move to higher frequencies with increasing pressure, these results suggesting the absence of any significant hydrogen bonding between the ammonium ions and the anions in the crystals.

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