Abstract
The displacement or replacement of adsorbed nitrogen from the surface of an evaporated barium film has been demonstrated by a series of flow experiments using a glass uhv system. The method consists of passing small controlled oxygen fluxes over a film that has previously sorbed nitrogen. The oxygen displaces nitrogen which is continually pumped away to be measured. The results show that for nitrogen sorptions by a barium film of less than 0.03 cm3 Torr/cm2 of actual film area, only a small fraction of the oxygen pumped (<3%) displaces nitrogen. This fraction increases as the film continues to take up nitrogen and decreases slowly with time once the film is isolated. The displacement reaction is very rapid and probably involves an exchange between oxygen and adsorbed molecular nitrogen.
Published Version
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