The diffusivity of the inert gas in crystals was studied by monitoring gas desorption kinetics during the annealing of previously saturated specimens. The results could be described by:

100-350C:     D (cm2/s) = 2.53 x 10-6 exp[-0.14(eV)/kT]

160-280C:     D (cm2/s) = 1.3 x 10-6 exp[-0.10(eV)/kT]

300-400C:     D (cm2/s) = 1.66 x 10-2 exp[-0.36(eV)/kT]

100-200C:     D (cm2/s) = 1.4 x 10-2 exp[-0.32(eV)/kT]

A.Y.Kupryazhkin, P.V.Volobuev, P.E.Suetin: Fizika Tverdogo Tela, 1974, 16[11], 3402-5

The best linear fits to the solute diffusion data ([336] to [347]) yield:

Ar: Ln[Do] = 0.77E – 13 (R2 = 0.98); Br: Ln[Do] = 0.49E – 18.3 (R2 = 0.88);

He: Ln[Do] = 1.17E – 15.9 (R2 = 0.58)