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 |
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Pages (from-to) | 281-284 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 50 |
Issue number | 4 |
DOIs | |
Publication status | Published - 24 Jan 1983 |
MoE publication type | A1 Journal article-refereed |