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The sorption of oxygen by films of barium evaporated in a vacuum has been studied. The speed of pumping and the capacity were measured. The speed of pumping has been found to be almost independent of the ionizing electron current in the oxygen gas. However, towards the end of the life of a film, it was found that all pumping ceased unless a hot tungsten filament was alight in the gas. Measurements of the variation of speed in the early life of a getter film, and of the influence of evaporation conditions upon pumping, show the importance of nucleation centres at which oxidation starts. The increase of speed and capacity with temperature show that these are limited by diffusion processes within the getter film.
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R N Bloomer (1957) studied this question.
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