Nuclear quadrupolar relaxation in liquid metals

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Abstract
The theory of nuclear quadrupolar relaxation in liquid metals is formulated in terms of the Van Hove functions and two approximations (A and B) are suggested for the correlation functions of the field gradient that are involved. The ion-ion potentials required are taken as those due to Appapillai and Williams (see abstr. A36507 of 1973). Detailed calculations are performed for Rb, Hg, Ga, In, Sb and Bi and the experimental data for Na, Cu and Al are also discussed. It is argued that approximation A underestimates and approximation B overestimates the cancellation between the two and three particle terms in the correlation functions and that the use of the Appapillai-Williams potential coupled with the ionic Sternheimer antishielding factor underestimates the field gradients involved. The temperature dependence of the relaxation rates is predicted to be somewhat less than that of D-1 where D is the diffusion constant, which agrees qualitatively with the experimental data.

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