Abstract
The analysis of nuclear spin relaxation data in disordered metal-hydrogen systems requires a model for the NMR spectral density functions. The approach of evaluating these functions analytically for small, finite systems is investigated. Calculations for an ordered system show that the results for a finite system can provide a good approximation to the infinite system results. The theory is applied to a disordered system and the results are compared with those from BPP model with a distribution of activation energies. The results for a model of site energy disorder show behaviour quite different from that of the BPP model, but are qualitatively consistent with previous Monte Carlo simulation results for the site energy disorder model.
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