Selectively excited core-to-core fluorescence of potassium halides.

Abstract

Core-to-core fluorescence transitions from resonantly excited K 2${\mathit{p}}^{\mathrm{\ensuremath{-}}1}$3d states in KF and KI have been measured and specific interaction energies of the final 3${\mathit{s}}^{\mathrm{\ensuremath{-}}1}$3d configuration were determined. Delocalization of the excited electron in the 2${\mathit{p}}^{\mathrm{\ensuremath{-}}1}$3d states was observed to compete with the core hole decay. Furthermore, evidence for an influence of the chemical surrounding on potassium properties such as the 3s core hole lifetime, the 3s3d exchange splitting, and the configuration interaction of the 3s core hole state was found.