Resonant inverse photoemission involving transition-metal3p−3dsubshell interactions

Inverse photoemission intensity variations for the Sc $3d$ empty states are studied for incident electron energies of 20.25 to 46.25 eV to examine interference effects related to $3p$ core-level excitation. A strong resonance, delayed ∼14 eV above the $3p$ threshold, is observed, together with an interference minimum 5-6 eV above threshold. The results reflect coupling between the inverse photoemission continuum and the Sc $3p-3d$ giant dipole resonant recombination channel. Angle-resolved measurements reveal photon emission dependences related to the surface dielectric response in the low-energy region.