A study was made of diffusion, in 5N-purity single crystals, by making out-gassing rate-measurements of specimens which were initially saturated with the given isotope (table 44). It was found that the absolute rate theory formalism of Vineyard provided an adequate explanation for the results if quantum corrections and anharmonic effects were taken into account.

L.Katz, M.Guinan, R.J.Borg: Physical Review B, 1971, 4[2], 330-41