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Figure 5
(a) Ir Lβ2 RXES map of IrO2 powder measured with four von Hamos analyzer crystals by scanning the incident photon energy of the self-seeded beam across the Ir L3-edge. Five spectral features are marked as A–E. The blue and red dashed lines are the Ir Lβ2 X-ray emission spectrum at Ei = 11.223 and 11.241 keV, respectively. The HERFD-XANES spectrum is obtained along the green dashed line at the fluorescence energy of 10.924 keV. (b) Energy-level diagram illustrating the Ir Lβ2 RXES (or 2p3/24d RIXS) process in IrO2. The vertical axis represents the total energy within an Ir4+ ion. The final states with orbital occupations of 4d95d6 are dipole-forbidden at the Ir N5- and N4-absorption edges. (c) Two representative Ir Lβ2 X-ray emission spectra from the RXES map at Ei = 11.223 and 11.241 keV. The features A–E are denoted. (d) The Ir L3-edge HERFD-XANES spectrum at the fluorescence energy 10.924 keV, which is plotted together with the TFY-XANES spectrum in Fig. 4[link](a) for comparison.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 6| November 2023| Pages 1038-1047
https://doi.org/10.1107/S1600577523007312
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