Resonant photoemission fromNiI2

Resonant photoemission from the valence band of ${\mathrm{NiI}}_2$ is reported in the region of the Ni 3p photothreshold. The Ni satellite structure is discussed in terms of a recent model previously applied to 2p core-level spectra, and from a comparison with 2p core-level data it is concluded that the photohole-induced modifications of final-state levels are the same whether the hole is 2p or 3d. This means that the theoretical model has to be modified, and the d-d correlation energy is estimated to be ∼10 eV. The resonant behavior of the 3d satellites can be understood in terms of different final-state configurations coupled to different intermediate states but the need for more detailed calculations is stressed.