Final-State Effects in the Eu $L_{\mathrm{III}}$-Edge Spectrum of Eu${\mathrm{Pd}}_2$${\mathrm{P}}_2$

The Eu $L_{\mathrm{III}}$-edge x-ray-absorption spectrum of Eu${\mathrm{Pd}}_2$ ${\mathrm{P}}_2$ exhibits a double-peaked white-line structure typical for mixed-valent materials, while Mössbauer isomer-shift and other magnetic measurements prove the divalent ground state of this compound. This discrepancy clearly shows the possible presence of final-state configuration-interaction effects in the $L_{\mathrm{III}}$-edge spectra of heavy-rare-earth systems, as well as a significant $4f$ covalent bonding, contrary to previous assumptions.