Multielectron satellites and spin polarization in photoemission from Ni compounds

Valence-band photoemission and its spin polarization of insulating Ni (Ni^2+: d^8) compounds are studied by considering configuration interactions within the Ni-ligand cluster. It is found that the main lines, which have been assigned to d-hole (d^7) final states, are due to final states where the d hole is screened by a ligand-to-d charge transfer and that the satellite contains significant d^7 character. Effects of these final-state interactions on the multiplet structure and the spin polarization are discussed.