Study of radioactive impurities in solids. - II. Effects of relaxation and radiofrequency

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Abstract
The nuclear radiation characteristics of a radioactive impurity embedded in a solid matrix, depend on the properties of the levels involved in the radiative processes. In this paper we investigate the evolution of these levels, in the presence of relaxation phenomena and of a radiofrequency field. The results which we derive, are then applied to perturbed angular correlations and nuclear orientation experiments (calculation of the perturbation factors, effect of radiofrequency saturation in NO-NMR experiments)