Nuclear Magnetic Resonance of Nitrogen−14 in Potassium Azide

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Abstract
The nuclear magnetic resonance of 14N split by large quadrupole interactions has been observed in single crystals of potassium azide (KN3). The observed spectrum at arbitrary orientation consists of eight resonance lines, which can be decomposed into two groups of four lines each. The resonances in each group are of the same apparent intensity, and one group is twice as intense as the other. The quadrupole coupling constants and asymmetry parameters of the two inequivalent nitrogens have been obtained from a rotation study. For the end nitrogen e2qQ/h=1.79±0.03 MHz with η=0.04±0.02. For the central nitrogen e2qQ/h=1.028±0.03 MHz with η=0.03±0.02. Unsuccessful attempts were also made to observe the pure quadrupole resonance of the end nitrogens.