Mechanism of the Kryptonation of Nickel by Film Evaporation

Abstract

Nickel films have been evaporated in the presence of krypton on to a Pyrex substrate maintained at 77 K, and the variation of the krypton incorporation with metal deposition rate and krypton pressure has been studied. Deposition rates were varied between 13 µg and 4.42 mg min–1 and krypton pressures between 3 × 10–3 and 1.3 Torr (0.4 and 173 N m–2). Krypton uptakes of up to almost 6 atom % have been observed. The results are interpreted in terms of a model based on the concept of cryotrapping.