Charge-transfer satellites in the 2p core-level photoelectron spectra of heavy-transition-metal dihalides

We extend the charge-transfer model with the core-hole 3d-electron Coulomb attraction [van der Laan et al., Phys. Rev. B 23, 4369 (1981)] to the 2p core-level photoemission satellite structures of cobalt, iron, and manganese dihalides. This model was found to account for the positions and intensities of satellites and main peaks very well with reasonable values of parameters. These parameter values show the expected trends not only along the ligand series from fluorine to bromine but also along the transition-metal series from copper to manganese. This gives us confidence that the charge-transfer mechanism is responsible for the satellite structures in the 2p core-level photoemission spectra of heavy-transition-metal compounds, and that the screening response is important even for insulators in the presence of a core hole. It also suggests the core-level photoemission spectra, if properly understood, can be used to obtain parameters on the valence-electronic structures.