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|Title:||Uranium 5d-5f Electric-multipole Transitions Probed by Nonresonant Inelastic X-ray Scattering|
|Authors:||CACIUFFO Roberto; VAN DE LAAN G.; SIMONELLI L.; VITOVA T.; MAZZOLI C.; DENECKE M. A.; LANDER G.h.|
|Citation:||PHYSICAL REVIEW B vol. 81 no. 19 p. 195104-1, 7|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Directorate:||Nuclear Safety and Security|
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