A study was made of the diffusion of Ar in ion-bombarded single crystals with various vacancy concentrations. The results for diffusion between 20 and 300C were compatible with an interstitial diffusion mechanism. The diffusion data could be described by:

D (cm2/s) = 1.0 x 105 exp[-1.5(eV)/kT]

H.J.Matzke: Zeitschrift für Naturforschung, 1967, 22a[4], 507-18