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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.
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