Correlations between electron and positron workfunctions on copper surfaces

Cherry A. Murray, Allen P. Mills, J. E. Rowe

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


We have performed contact potential difference measurements on low-index faces of copper in ultrahigh vacuum using positrons as positive test particles in a retarding field analyzer. For negative positron affinity surfaces bombarded with keV positrons we also measured energy distributions of reemitted slow positrons and found them to sharply peaked in energy about a value which we label −φ+. Both adsorbing sulfur on a Cu(111) sample and raising its temperature cause changes in φ+ which are equal and opposite to the contact potential change of the sample, i.e. the electron workfunction change. This result is in complete accordance with φ+ being a measure of the negative positron workfunction of the sample and high temperature or adsorbates inducing a change only in the electrostatic surface dipole layer.

Original languageEnglish (US)
Pages (from-to)647-664
Number of pages18
JournalSurface Science
Issue number3
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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