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Transuranium compounds probed by nonresonant inelastic x-ray scattering

DOI: 10.1103/PhysRevB.101.075103 DOI Help

Authors: M. Sundermann (University of Cologne; Max Planck Institute for Chemical Physics of Solids) , L. Simonelli (European Synchrotron Radiation Facility (ESRF); ALBA Synchrotron Light Source) , S. Huotari (University of Helsinki) , R. Eloirdi (European Commission, Joint Research Centre (JRC)) , G. H. Lander (European Commission, Joint Research Centre (JRC)) , R. Caciuffo (European Commission, Joint Research Centre (JRC)) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 101 , PAGES 075103

State: Published (Approved)
Published: February 2020

Abstract: While x-ray absorption spectroscopy is mainly governed by electric-dipole transitions, the technique of non-resonant inelastic x-ray scattering (NIXS) offers the possibility to explore higher-order multipole transitions. These transitions obey different selection rules that can reach final states of higher angular momenta, opening complementary spectroscopic perspectives. Here, we investigate the suitability of NIXS to study transuranium compounds. We show that the K edge of the Be encapsulation can be practically fully excluded by using the imaging capabilities of the technique arising from the position of the signals on the multidetector. Experimental results for the multipole transitions at the actinide O4,5 edges (90–120 eV) in UO2, NpO2, PuO2, and Pu2O3 are compared with multielectronic calculations. The spectral features are shown to be very sensitive to the ratio of the triakontadipole and octupole transitions, which could potentially be used to assess the radial expansion of the 5f wave function, which is expected to occur in covalent mixing with the O 2p states.

Journal Keywords: NIXS; Actinides; Multiplet calculations

Subject Areas: Physics, Materials

Facility: ID16 at ESRF

Added On: 30/06/2020 09:18

Discipline Tags:

Materials Science Physics Hard condensed matter - structures

Technical Tags: