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X-ray photoelectron spectra indicate core-electron binding-energy splittings of 6 eV for the 3s levels in MnF₂, MnO, and FeF₃, and less pronounced effects on the 3s levels in MnO₂ and Fe metal. These splittings are considerably reduced from free-ion predictions but agree well with calculations for Mn in a cluster environment. The 3p multiplet splittings are shown to behave in a quantitatively different fashion.
Fadley et al. (Mon,) studied this question.