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,
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