Whilst x-ray absorption spectroscopy is mainly governed by electric-dipole transitions, the techniquefof non-resonant inelastic x-ray scattering (NIXS) offers the possibility to explore higher-orderfmultipole 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 almost 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 different multipole 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.
SUNDERMANN M.;
SIMONELLI L.;
HUOTARI S.;
ELOIRDI Rachel;
LANDER G. H.;
CACIUFFO Roberto;
VAN DER LAAN G.;
2020-05-05
AMERICAN PHYSICAL SOCIETY
JRC119507
0163-1829 (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC119507,
10.1103/PhysRevB.101.075103 (online),
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