Photoelectron Spin Polarization Testing the Ionic Structure of3dLevels in Ferrites

The dependence of photoelectron spin polarization on photon energy with ultrahigh-vacuum-cleaved surfaces of several ferrites shows that the electronic excitation spectrum of $3d$ states is described by the model of a single ion in a crystal field in all details. We obtain the relative intensity of the multiplet lines as well as the energy difference of $3d^{n-1\mathrm{}}$ final states on $A$- and $B$-lattice sites with high precision.