Abstract
The attractive interaction energy between a positronium atom and a metal surface has been numerically evaluated using our earlier-derived expression. In this derivation the interaction energy is obtained by considering the multipolar excitations of the positronium atom and excitations of the surface plasmons. It is shown that the interaction energy saturates to a constant value at the surface, and near the surface the interaction energy is considerably weaker than that given by the well-known semiclassical Lifshitz result.
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