Abstract
The technique of nuclear magnetic pulsed double resonance has been used to study the quadrupole interactions of 14N in a single crystal of ammonium dihydrogen phosphate. The double resonance spectra are examined in some detail, and the advantages of this technique over conventional methods are discussed. For 14N in ammonium dihydrogen phosphate eQNVZZ/h = 24·0±2·0 kHz, and n = 0.