Uranium 5d-5f Electric-multipole Transitions Probed by Nonresonant Inelastic X-ray Scattering

Non-resonant inelastic x ray scattering (NIXS) experiments have been performed to probe the 5d-5f electronic transitions at the uranium O4;5 absorption edges in uranium dioxide. For small values of the scattering vector q, the spectra are dominated by dipole-allowed transitions encapsulated within the giant resonance, whereas for higher values of q the multipolar transitions of rank 3 and 5 give rise to strong and well-de¯ned multiplet structure in the pre-edge region. The origin of the observed non-dipole multiplet structures is explained on the basis of many-electron atomic spectral calculations. The results obtained demonstrate the high potential of NIXS as a bulk-sensitive technique for the characterization of the electronic properties of actinide materials.

CACIUFFO Roberto;  VAN DE LAAN G.;  SIMONELLI L.;  VITOVA T.;  MAZZOLI C.;  DENECKE M. A.;  LANDER G.H.; 

2010-05-25

AMER PHYSICAL SOC

JRC56751

1098-0121,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC56751,   

10.1103/PhysRevB.81.195104,