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  Transuranium compounds probed by nonresonant inelastic x-ray scattering

Sundermann, M., Simonelli, L., Huotari, S., Eloirdi, R., Lander, G. H., Caciuffo, R., et al. (2020). Transuranium compounds probed by nonresonant inelastic x-ray scattering. Physical Review B, 101(7): 075103, pp. 1-8. doi:10.1103/PhysRevB.101.075103.

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 Creators:
Sundermann, M.1, Author              
Simonelli, L.2, Author
Huotari, S.2, Author
Eloirdi, R.2, Author
Lander, G. H.2, Author
Caciuffo, R.2, Author
van der Laan, G.2, Author
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              

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 Abstract: While x-ray absorption spectroscopy is mainly governed by electric-dipole transitions, the technique of nonresonant 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 O-4,O-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.

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Language(s): eng - English
 Dates: 2020-02-032020-02-03
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 101 (7) Sequence Number: 075103 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008