Charge transfer and positron states at alkali-metal-covered nickel surfaces
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© 1988 American Physical Society (APS). This is the accepted version of the following article: Nieminen, Risto M. & Jensen, Kjeld O. 1988. Charge transfer and positron states at alkali-metal-covered nickel surfaces. Physical Review B. Volume 38, Issue 8. 5764-5767. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.38.5764, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.38.5764.
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School of Science |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors
Date
1988
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Language
en
Pages
5764-5767
Series
Physical Review B, Volume 38, Issue 8
Abstract
We report calculations of the positron surface state on clean and alkali-metal- (Na,Cs) covered Ni surfaces. It is shown that the alkali adsorption increases the surface-state binding energy. With the lowering of the electron work function, this leads to positronium desorption energies which are weakly dependent on the alkali coverage, in agreement with the recent experiments of Gidley, Köymen, and Capehart. It is shown that the positron becomes mainly localized between the substrate and the overlayer, and that the lifetime is shorter for positrons on the alkali-metal-covered surface.Description
Keywords
nickel surfaces, positron states
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Citation
Nieminen, Risto M. & Jensen, Kjeld O. 1988. Charge transfer and positron states at alkali-metal-covered nickel surfaces. Physical Review B. Volume 38, Issue 8. 5764-5767. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.38.5764.