Resonant inelastic x-ray scattering from U 3 O 8 and UN.

Autor: Lawrence Bright E; European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble 38043, France., Xu L; Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87544, United States of America., Harding LM; University of Bristol, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom., Springell R; University of Bristol, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom., Walters AC; Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom., Sundermann M; Institute of Physics II, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany.; Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187 Dresden, Germany., Garcia-Fernandez M; Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom., Agrestini S; Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom., Caciuffo R; European Commission, Joint Research Centre, Postfach 2340, D-76125 Karlsruhe, Germany.; Istituto Nazionale di Fisica Nucleare, Via Dodecaneso 33, IT-16146 Genova, Italy., van der Laan G; Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom., Lander GH; University of Bristol, HH Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
Jazyk: angličtina
Zdroj: Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2023 Feb 28; Vol. 35 (17). Date of Electronic Publication: 2023 Feb 28.
DOI: 10.1088/1361-648X/acb8f4
Abstrakt: Resonant inelastic x-ray scattering (RIXS) using an incident energy tuned to the uraniumN4,5absorption edges is reported from epitaxial films of α -U 3 O 8 and UN. Theory shows that for U 3 O 8 the multiplets associated with a 5 f 1 configuration with a ground state of2F5/2and the excited state of2F7/2are observed. However, the strong transition predicted at a transfer energy of 1.67 eV is not observed. We assume this is a consequence of the intermediate state lifetime broadening due to interaction with continuum states when the transferred energy exceeds the onset of the continuum in the presence of the core hole. This hypothesis is supported by the results obtained for the 5 f -itinerant system UN, where no sharp transitions have been observed, although the broad scattering response centred at ∼1 eV is considered a signature of a predominantly 5 f 3 configuration in this band-like semi-metallic system. These experiments and theory add important information on these materials, both of which have been investigated since the 1960s, as well as whether RIXS at the uranium N edge can become a valuable tool for actinide research.
(© 2023 IOP Publishing Ltd.)
Databáze: MEDLINE
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