Abstract
The reaction of oxygen, water vapour, carbon monoxide and carbon dioxide with films of barium evaporated on sputter-cleaned nickel has been studied at room temperature. The initial reaction probability and the chemical state of the exposed film were investigated by means of Auger electron spectroscopy. The initial increase of oxygen and carbon Auger signals was found to be (within the experimental error) linearly dependent on degree of exposure up to pressures of 6 × 10 −6 Pa. Its dependence on film thickness (up to thicknesses of 25 A) showed that the initial reaction occurs apparently homogeneously through the barium layer. Assuming a flat surface the initial reaction probability for oxygen is 0.4, for water vapour 0.6, for carbon monoxide 0.2 and for carbon dioxide 0.6.
Published Version
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