Resonant inelastic x-ray spectroscopy (RIXS) on UO<sub>2</sub> - a test case for actinide materials
ORAL
Abstract
A successful soft x-ray resonant inelastic x-ray spectroscopy (RIXS) experiment of UO2 at the U N4 absorption edge (778 eV) will be presented [1]. The RIXS spectra exhibit well resolved excitations due to the crystal-field splitting of the U4+ 5f 2 J=4 (3H4) Hund's rule ground state, and they show the first excited multiplet (3F2) at 550 meV. In RIXS the 3H4→3F2 transition has a strong cross-section due to the beyond dipole features of the RIXS process which is in strong contrast to the dipole cross-section of inelastic neutron scattering. Hence, the present experiment settles the discussion about the U4+ multiplet splitting in UO2. The data are simulated with a full multiplet RIXS calculation, taking into account the RIXS cross-section.
[1] G. H. Lander et al., tbp
[1] G. H. Lander et al., tbp
*MS gratefullyacknowledges the financialsupportof the Deutsche Forschungsgemeinschaft under project SE1441-5-1.
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Presenters
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Martin Sundermann
- Max Planck Institute for Chemical Physics of Solids
- Institute of Physics II, University of Cologne, Cologne, Germany