On the deuteron magnetic resonance in single crystals of ND4Cl and ND4Br

The deuteron quadrupole coupling constants in ND4Cl and ND4Br have been measured. The results are 179.9±2.0 and 180.0±2.0 kHz, respectively. From the temperature dependence of the line width in ND4Cl for the d. c. magnetic field along [100] the hindered rotation potential barrier of the ND4+-ion was found to be 5.1 kcal/mole. In crystals containing moisture a narrow line component was observed, which is probably due to the formation of an eutectic solution.