Quantitative LEIS analysis of thermionic dispenser cathodes

H.M.R. Cortenraad, A.W. Denier van der Gon, H.H. Brongersma, G. Gärtner, A. Manenschijn

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)


An UHV LEIS setup has been converted into a dedicated apparatus to study the surface composition, structure and dynamics of real dispenser cathodes and cathode model systems based on W single crystals. LEIS, AES and LEED are available to investigate the surface characteristics, and the cathode emission properties are derived in situ from a close-spaced diode configuration. In this paper, the focus is on the quantitative surface composition of B-type and M-type dispenser cathodes by LEIS. A straightforward quantification is hampered by the influence of the cathode workfunction on the neutralisation of the ions. It is shown that the ion fraction decreases as the workfunction of the cathode decreases. The Ba surface density is observed to increase with decreasing workfunction. However, before an accurate quantitative surface analysis can be performed a validation of the model used to correct for the influence of the ion fraction has to be performed.
Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalApplied Surface Science
Issue number1-4
Publication statusPublished - 1999


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