Nuclear Quadrupole Resonance of N14 in Solid N2

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Abstract
Pure quadrupole resonance of N14 in the α phase of solid nitrogen has been studied in the temperature range from 1.5° to about 34.5°K. The resonance frequency at 4.2°K is 3.4873±0.0001 Mc. The line shape and relaxation times at 4.2°K are discussed. A hydrostatic compression to 130 atm at 4.2°K gives (dν/dP)4.2=33 cps/atm. The temperature dependence of the resonance frequency below 20°K has been analyzed in terms of a modified Bayer theory in which account is taken of volume expansion. The torsional frequency of oscillation of the molecule is found to be νt=1.12×1012 sec—1, and the quadrupole resonance frequency without zero‐point vibrations is ν0=4.16 Mc. The resonance frequency decreases very rapidly as the phase transition at 35.6°K is approached and pure quadrupole resonance has not been observed in the β phase.

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