Experimental data were presented which revealed the essential features of atomic H which had been incorporated from various sources at low temperatures. Appropriate conditions for hydrogenation were chosen, and the H diffusivity was found to be described by:

D (cm2/s) = 2.0 x 10-5 exp[-0.49(eV)/kT]

S.V.Koveshnikov, S.V.Nosenko, E.B.Yakimov: Physica Status Solidi A, 1990, 120[2], 391-5