The diffusivities were determined, at 208 to 338K, under gas pressures of between 10 and 104bar. It was found that the results could be described by:

D (cm2/s) = 1.13 x 10-3 exp[-6.5(kcal/mol)/RT]

S.Majorowski, B.Baranowski: Journal of the Physics and Chemistry of Solids, 1982, 43[12], 1119-27