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The nuclear quadrupole relaxation probability W 1  of  23 Na in a single crystal of NaNO 2  has been studied by applying a selective 180° pulse to the centre line and monitoring the exponential approach to equilibrium of the satellites. The orientation dependence of W 1  at 170 K is similar in form to that at 298 K, indicating that the lattice motions responsible for the relaxation are similar at both temperatures. Ratios of the M-tensor components obtained by fitting the W 1  data have been compared with the results of various point charge calculations. It indicates that the relaxation is primarily caused by interaction with the four nearest oxygen atoms and confirms that the NO 2  groups oscillate and reorient primarily about the c axis.

Orientation Dependence of the Nuclear Quadrupole Spin-lattice Relaxation of 23 Na in NaNO 2