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Figure 4
(a) Measured RIXS spectra with different spectrometers at the same pressure (1.2 GPa). The inset shows that the sample and its surroundings at the pressure. The spectrometer with a diced spherical analyzer gives huge extrinsic signals around the elastic point, whereas the SXC-RIXS spectrometers do not. (b) Measured RIXS spectra using the SXC-RIXS spectrometer with different pressures. As the inset shows, at 15.6 GPa, the Be gasket has collapsed and the sample can no longer be seen. (c) The same RIXS spectrum taken by an MCA in (a), which is fitted using Gaussian line shapes. The spectrum is well fitted by three peaks, which correspond to an elastic peak, magnon, and dd-excitation. (d) The same RIXS spectrum taken by a spherical analyzer in (a), which is plotted with the same Gaussian functions in (c). This spectrum cannot be well fitted since it contains lots of extrinsic signals from other than the sample.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 4| July 2020| Pages 963-969
https://doi.org/10.1107/S1600577520005792
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