Abstract
The temperature dependence of the intramolecular dipolar splitting of the nuclear quadrupole resonance of 14N has been studied in solid αnitrogen from 4.2 to 35.6°K by observing the modulation of the envelope of the spin echoes. Over this temperature range the modulation period increases by 20% and this is ascribed to progressive motional averaging of the dipolar interaction by the molecular librations. The averaging factor is identical within 2 % with that for the quadrupole resonance frequency and is satisfactorily explained theoretically using published Raman data on the libration frequencies.
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