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Figure 3
(a) Numerical simulations showing the total energy resolution of our RIXS instrument as a function of linear dispersion of the source and incident bandwidth. We use the Rowland spectrometer setup in Fig. 2[link](a) with an α-SiO2(003) analyzer and incident energy tuned to the U M5-edge (3551 eV). A clear minimum is observed away from the point-source limit (Gsrc = 0), largely in agreement with equation (2)[link]. (b) Vertical cuts through the minimum and the point-source in (a), dashed and solid line, respectively. This depicts how the total energy resolution depends on the incident bandwidth. The data for the point-source is overlaid with the expected behavior of ΔEtot = [(E_{\rm a}^{\,2}+E_{\rm i}^{\,2})^{1/2}] for a Gaussian error distribution. Here Ea = 44 meV.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 1| January 2026| Pages 218-226
https://doi.org/10.1107/S1600577525010318
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