Abstract
Low energy ion scattering (LEIS) is used to study the surface-composition and structure of B-type dispenser cathodes. Measurements between room temperature and 1150°C gave identical results, which shows that the surface structure of Ba and O on the cathodes is not dependent on temperature. The results rule out any structure with O in the outermost layer (at the same height or above Ba). On cathodes poisoned by oxygen we found that the results are in agreement with a model where O is positioned on top of the Ba. In addition we demonstrate how LEIS may be used to determine the sputter yield of Ba from a cathode by Ar + ions by monitoring the Ba coverage as a function of ion dose.
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