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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 |
Publication Year: | 2010 |
JRC N°: | JRC56751 |
ISSN: | 1098-0121 |
URI: | http://publications.jrc.ec.europa.eu/repository/handle/JRC56751 |
DOI: | 10.1103/PhysRevB.81.195104 |
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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