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 17). 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

Table 17

Parameters for H Isotope Diffusion in Cu Single Crystals at 720 to 1200K