The influence of inter-atomic transitions in Auger valence band spectroscopy: oxygen on Si(001)2x1

Herbert Wormeester, Herman J. Borg, Arend van Silfhout

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In this paper we will show that the description of an Auger process in terms of a process confined to one atom is in general not adequate and the Mulliken population is only in very specific cases a good alternative in evaluating the strength of inter-atomic transitions. The ionicity of the chemical bond cannot be used as a direct measure of the contribution of inter-atomic Auger transitions, as will be demonstrated in the case of the oxygen KVV Auger transitions in gaseous molecular oxygen and oxygen chemisorbed on the Si(001) surface. A full evaluation of inter-atomic transition rates shows that their strength depends on the inter-atomic distance as well as on the screening of the initial core hole.
Original languageUndefined
Pages (from-to)197-209
Number of pages13
JournalSurface science
Issue number258
Publication statusPublished - 1991


  • IR-24157
  • METIS-128956

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