The permeation response of the gas under the influence of an oscillating pressure was determined in order to deduce the diffusion coefficient. The results obtained by using this method could be described by:

D (cm2/s) = 5.08 x 10-3 exp[-9.4(kcal/mol)/RT]

A.Tahara, Y.Hayashi: Journal of the Japan Institute of Metals, 1984, 48[12], 1152-6