Multi-electronic effects in uranium dioxide from X-ray Emission Spectroscopy

X-ray Emission Spectroscopy (XES) and Bremstrahlung Isochromat Spectroscopy (BIS), two electron-in/photon-out measurements, have been used to probe multi-electronic effects in the important actinide compound, uranium dioxide (UO2). The new observables in the XES are a distinct satellite, a core-to-core-transition, and the lack of a spin-orbit-split satellite peak. New XES data for 4f and 4p derived transitions are presented and discussed. Electron shielding in the 4d5/2 main and satellite XES peaks is discussed in light of the experimental observations.