Universität zu Köln

Sundermann, M., Simonelli, L., Huotari, S., Eloirdi, R., Lander, G. H., Caciuffo, R. and van der Laan, G. (2020). Transuranium compounds probed by nonresonant inelastic x-ray scattering. Phys. Rev. B, 101 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sundermann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Simonelli, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Huotari, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eloirdi, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lander, G. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caciuffo, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Laan, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-345621
DOI:	10.1103/PhysRevB.101.075103
Journal or Publication Title:	Phys. Rev. B
Volume:	101
Number:	7
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETIC CIRCULAR-DICHROISM; RESONANT PHOTOEMISSION; ABSORPTION-SPECTRA; SPECTROSCOPY; TRANSITION; SPECTROMETER; STATES Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34562