By using the method of desorption from previously saturated specimens, the coefficients of diffusion were determined in single crystals at 473 to 823K. The data (tables 147 and 148) could be described by:

3He:     D (cm2/s) = 1.8 x 10-2 exp[-0.36(eV)/kT]

4He:     D (cm2/s) = 1.5 x 10-2 exp[-0.36(eV)/kT]

L.V.Gulin, P.V.Volobuev, I.A.Korolev, P.E.Suetin: Fizika Tverdogo Tela, 1977, 19[4], 1017-20

Table 148

Isotope Effect for 3He and 4He Diffusion

in RbCl Single Crystals