Diffusion of helium in FCC metals

Abstract
Diffusion constants of helium in gold, silver and aluminium are determined from thermal desorption experiments, giving: Au: D 0 = 10−1.0 cm2/sec, ΔH = 1.70 eV Ag: D 0 = 10−1.2 cm2/sec, ΔH = 1.50 eV Al: D 0 = 10+0.1 cm2/sec, ΔH = 1.35 eV The results are compared to self-diffusion and to the diffusion of other light elements in metals. Possible diffusion mechanisms are discussed.