Abstract
The spectral density functions for the relaxation of nuclear spinsdue to time-dependent electric quadrupole interactions are studiedfor the diffusion of atoms on a crystal structure. It is shown that,for an arbitrary concentration c of diffusing atoms, the spectraldensity functions and consequent relaxation rates scale withconcentration as c(1-c). The detailed forms of the functions can beobtained simply from analysis of the low spin concentration limit,unlike the analogous case for magnetic dipolar relaxation. Someapplications to metal-hydrogen systems are described.
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