2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29171We present metal 3s x-ray photoelectron spectra of different transition metal oxides. The values of the 3s exchange splitting for the 3d metal oxides are given as a function of the 3d electron number in the ground state. The spectra were analysed using the simple two-configuration model of the interatomic configuration mixing. The change of the 3s spectra is ascribed to the change of the charge-transfer energy.17 pages with 9 embedded postscript figures, uses ioplppt.styMaterials Sciencetext