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Photoemission spectra from the shallow 3{ital p}{sub 3/2} core levels of the surface atoms of metallic potassium exhibit the effects of a small but measurable crystal-field splitting of {similar_to}38 meV. It manifests itself mainly as an apparent angle-dependent modulation of the spin-orbit splitting. This phenomenon may, in general, interfere with accurate determinations of surface-atom core-level shifts.

Evidence for crystal-field splitting in surface-atom photoemission from potassium