Positron surface states on clean and oxidized Al and in surface vacancies

R. M. Nieminen; M. J. Puska

doi:10.1103/PhysRevLett.50.281

Positron surface states on clean and oxidized Al and in surface vacancies

R. M. Nieminen^*, M. J. Puska

^*Corresponding author for this work

Department of Applied Physics

University of Jyväskylä

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Abstract

This Letter reports on the first discrete-lattice calculation of positron surface states on the surfaces of Al. The authors reproduce the observed values and anisotropy of the binding energies on clean surfaces, and predict the surface-state lifetimes. The temperature-independent lateral diffusion constant is calculated. Monovacancies on surfaces are predicted not to trap positrons. The effect of ordered chemisorbed monolayers of oxygen is investigated: Oxidation makes the surface state unstable with respect to positronium emission.

Original language	English
Pages (from-to)	281-284
Number of pages	4
Journal	Physical Review Letters
Volume	50
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.50.281
Publication status	Published - 24 Jan 1983
MoE publication type	A1 Journal article-refereed

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AB - This Letter reports on the first discrete-lattice calculation of positron surface states on the surfaces of Al. The authors reproduce the observed values and anisotropy of the binding energies on clean surfaces, and predict the surface-state lifetimes. The temperature-independent lateral diffusion constant is calculated. Monovacancies on surfaces are predicted not to trap positrons. The effect of ordered chemisorbed monolayers of oxygen is investigated: Oxidation makes the surface state unstable with respect to positronium emission.

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Positron surface states on clean and oxidized Al and in surface vacancies

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