RESONANT PHOTOEMISSION IN UMN2

Resonant conduction band photoemission measurements using synchrotron radiation are presented for UMn//2. The variation of the photon energy around both the U 5d yields 5f and the Mn 3p yields 3d excitation energy permits the identification of predominantly delocalized U 5f states at E//F and of Mn 3d states around 2. 5 ev below E//F. A structure at 1. 3 ev below E//F resonates only weakly at the U 5d as well as the Mn 3p threshold and is therefore attributed to U 6d states. The pronounced resonance behavior of the oxygen 2p derived emission at the Mn 3p threshold indicates a preferential oxidation of Mn.