Room-temperature 111Cd positron annihilation correlation measurements were performed by exploiting the high specific activity of 111In in methanol–water mixtures with various concentrations. The results revealed that the perturbation factors did not reflect the dependence of the macroscopic viscosity. The observed dynamic character of the positron annihilation correlation spectra in ice was explained in terms of the mobility of orientational and ionic defects. The activation energy for the diffusion process was deduced to be 0.35eV.

Fluctuating Electric Field Gradients at 111Cd in Ice. Z.Z.Akselrod, D.V.Filossofov, O.I.Kochetov, N.A.Korolev, N.A.Lebedev, M.Milanov, A.F.Novgorodov, E.N.Shirani, V.V.Timkin, A.I.Velichkov: Hyperfine Interactions, 2001, 136-137[3-8], 705-10