Separate measurement of the 5f5/2 and 5f7/2 unoccupied density of states of UO2

Author(s): Tobin, JG; Nowak, S; Booth, CH; Bauer, ED; Yu, S-W; Alonso-Mori, R; Kroll, T; Nordlund, D; Weng, T-C; Sokaras, D | Abstract: © 2019 Coupling High Energy Resolution Fluorescence Detection (HERFD) with electric dipole selection rules, the uranium 5f 5/2 and 5f 7/2 Unoccupied Densities of States (UDOS) have been determined in UF 4 , UO 2 and UCd 11 . Striking changes were observed between UF 4 (5f 2 ) to UCd 11 (5f 3 ), consistent with the Intermediate Coupling Model. Results for UO 2 were confirmed by Bremstrahlung Isochromat Spectroscopy (BIS). This new approach can be a powerful tool for shedding light on the hidden mysteries of Actinides 5f-electrons properties.