Mass spectrometry was used to monitor the permeation of Ne through monocrystalline membranes of the halide. The diffusion data could be described by:

D (cm2/s) = 2.2 x 10-2 exp[-0.37(eV)/kT]

Rare-Gas Solubility and Diffusion in the Potassium Halides. R.C.Wayne: Physical Review B, 1973, 8[6], 2958-64