Abstract
The gettering properties of lithium films for O 2, CO 2 and H 2O were examined in a vacuum system with a heater for lithium evaporation. The absorbed amounts of O 2, CO 2 and H 2O observed were in the ratio, O 2/Li=0.2, CO 2/Li=0.01 and H 2O/Li=0.12. The gettering action for H 2O was saturated at a relatively low lithium evaporation amount. The hydrogen uptake of a lithium oxide film was also investigated by using an ion irradiation apparatus with a thermal desorption spectroscopy. The ratio of retained hydrogen was H/Li ≃ 0.7, which was roughly the same as in the case of a fresh lithium film. The helium ion irradiation reduced the hydrogen retention of the lithium oxide film. The retained amount was 50% of that before the helium ion irradiation.
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