Abstract
The ionization of xenon Rydberg atoms excited to the lowest-lying state in the $n=17$ and 20 Stark manifolds at Au(111) surfaces is investigated as a function of the angle of incidence. Analysis of the data points to the presence of localized stray fields at the surface associated with surface inhomogeneities, which modify the atom-surface separation at which ionization occurs. A simple model is presented to justify this assertion and its implications are discussed.
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