Abstract
The hydrogen absorption rates of tantalum films with palladium overlayers and oxygen contamination are compared with curves for pure tantalum and palladium films. The palladium overlayers have no effect on the absorption of hydrogen by tantalum, whereas the absorption of 3.5 × 10 15 O 2 molecules cm −2 between the tantalum and palladium layers reduces the hydrogen absorption rate to that of the palladium overlayer. Absorption of oxygen on top of the palladium overlayer decreases the initial hydrogen reaction rate by several orders of magnitude.
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