Thermionic cathodes studied by low-energy ion scattering spectroscopy

A.W. Denier van der Gon, M.F.F.K. Jongen, H.H. Brongersma, U. Slooten, van, A. Manenschijn

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    18 Citations (Scopus)
    4 Downloads (Pure)


    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.
    Original languageEnglish
    Title of host publicationIVESC '96 : proceedings of the international vacuum electron sources conference 1996, Eindhoven, The Netherlands, July 1-4, 1996
    Publication statusPublished - 1997

    Publication series

    NameApplied Surface Science
    ISSN (Print)0169-4332


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