Positron surface states on clean and oxidized Al and in surface vacancies
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- University of Jyväskylä
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.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 24 Jan 1983|
|MoE publication type||A1 Journal article-refereed|