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Uranium 5d-5f electric-multipole transitions probed by nonresonant inelastic x-ray scattering

DOI: 10.1103/PhysRevB.81.195104 DOI Help

Authors: R. Caciuffo (Institute for Transuranium Elements) , G. Van Der Laan (Diamond Light Source) , L. Simonelli (European Synchrotron Radiation Facility) , T. Vitova (Institut für Nukleare Entsorgung) , C. Mazzoli (European Synchrotron Radiation Facility) , M. A. Denecke (Institut für Nukleare Entsorgung) , G. H. Lander (Institute for Transuranium Elements)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 81 (19)

State: Published (Approved)
Published: January 2010

Abstract: Nonresonant inelastic x-ray scattering (NIXS) experiments have been performed to probe the 5d-5f electronic transitions at the uranium O-4,O-5 absorption edges in several systems characterized by either a localized or itinerant character of the U 5f electrons, namely, UO2, USe, US, and elemental uranium in the alpha form. For small values of the scattering vector q, the spectra are dominated by dipole-allowed transitions encapsulated within the ill-defined giant resonance, whereas for higher values of q the multipolar transitions of rank k=3 and 5 give rise to strong and well-defined multiplet peaks in the pre-edge region. The origin of the observed nondipole 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. The different U compounds show strong variations in the O-5 structure that can be correlated with the ground-state properties of the materials.

Subject Areas: Physics

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Added On: 18/06/2010 14:34

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