Solid-state screening effect on the post-collision interaction

Photoexcited N4,5O1O2,3 Auger transitions for La3+ in LaF3, an insulator, are studied with the photon energy tuned through the La 4d to 4f resonant excitations. The post-collision interaction between the photoexcited electron and the Auger electron leads to a shift in the Auger kinetic energies. The shift is reduced by 2.3 eV for the same Auger transitions in LaB6, a metal, due to metallic screening.