The effect of translational impurity diffusion during the acoustic saturation of nuclear magnetic resonance was confirmed experimentally for these alkali halide crystals. The contribution of the impurity mechanism of spin-lattice coupling, as governed by the translational defect mobility, predominated at room temperature but did not play a role at temperatures below 200K, or at low ultra-sound powers.

A.L.Stolypko: Fizika Tverdogo Tela, 1995, 37[1], 55-9 (Physics of the Solid State, 1995, 37[1], 26-8)