Core-level XPS spectra of supported 3d-metal ultrathin layers: experimental and theoretical studies

Abstract.- In order to discuss the relation between the core level c-XPS spectra and the local electronic and magnetic properties of supported 3d transition metal atoms, we incorporate the various Coulomb and exchange interactions into a generalized impurity Anderson Hamiltonian, both in the initial state (Udd, Jdd) and final state (Udc, Jdc) of the c-XPS process. Then we discuss recent experimental 3s-XPS spectra of Fe and CO ultrathin-layers upon Cr(100) as well as V clusters upon graphite in terms of the two limits of the preceding Hamiltonian: (1) the exchange splitting limit (Jdc) and (2) the dielectric relaxation limit (Udc). 1