Abstract
For pt.V see ibid., vol.14, p.447 (1981). The theory of the two-spin correlation functions J(p)( omega ) that determine nuclear spin relaxation rates has been developed for the monovacancy limit of high spin concentrations using the encounter model of Einenstadt and Redfield. The theory is based upon a rate equation for the spin pair probability function and avoids the assumption of a Poisson distribution used by Wolf which is only valid if the spin motions are uncorrelated. In the high-frequency limit omega tau s>>1 and omega tau v<>1 the results obtained disagree with those obtained by Feeders (1979) using a moment expansion.