Approximation of the Blume’s stochastic model by asymptotic models for PAC relaxation analysis

The time-dependent perturbation factors G₂(t) of PAC are numerically calculated by diagonalizing the Blume’s supermatrix when static and fluctuating electric field-gradients are simultaneously present at the nucleus. The calculated functions are fitted with the expression of G₂(t) given by isotropic models, strictly valid for asymptotic conditions. The asymptotic relations between the spin relaxation constant λ and the jump frequency w introduced in the stochastic model are found to be a good approximation in large domains of w values.