The concentration dependence of the relaxation time of N2minus;in sodium azide was studied using paramagnetic resonance at 4.2deg;K. The relaxation rate was found to be independent of defect concentration within the experimental error of the saturation technique employed. The relaxation time product,T1T2, displayed the same strong anisotropy at K band (23 GHz) as was previously reported at X band. With the crystal platelet parallel to the static magnetic field,T1T2equals;0.5times; 10minus;12sec2, and with the crystal platelet perpendicular to the static field,T1T2equals;1.6times; 10minus;12sec2. The concentration was shown to be linear with irradiation time over the temporal range of interest by employing optical studies. These experiments indicate that the dominant relaxation mechanism is intramolecular in nature.
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