Satellite structure of the x-ray photoemission in Rb, Ca, and Ba metals

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Abstract
The x-ray photoemission core lines of metallic Rb, Ca, and Ba have been considered. It is emphasized that the experimental satellite structure of the Rb 3d lines can be explained on the basis of an intrinsic plasmon model and the core holes are screened mainly by s and p conduction electrons. In the case of Ca and Ba metals, the situation is different because the screening is mainly due to nearly localized d electrons in accordance with the Z+1 approximation. It is suggested that the high-intensity satellites are caused by the empty d states which have been lowered down below the Fermi level during the ionization process. This explanation should apply to the core lines possessing the orbital angular momentum 1≠0, and it is possible that the binding energy of these valence hole satellites is reduced by the influence of intrinsic plasmons.