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Figure 2
(a) A schematic of our Rowland spectrometer, showing sample, analyzer and detector on a common circle. L is the sample–analyzer and analyzer–detector distance. The analyzer is partially masked in the vertical direction (dark gray area) to limit the Johann error. The incident beam (source) has an energy range of Esrc = Ei ± ΔEi/2. The linear dispersion on the detector [Gdet, see equation (1)[link]] is depicted as blue (gain) and red (loss) colors. The local z-axis for both sample and detector is also shown. (b) Limited view of the now elongated source with a linear dispersion of Gsrc < 0 (higher zsrc has a lower energy). A single analyzer pixel is used and all photons from the sample are parallel. Since the pixel only diffracts photons with an energy of Ei the single pixel effectively reverses the linear dispersion of the source. We go from ΔEi/2 in energy gain to ΔEi/2 in energy loss from the top to the bottom. By selecting Gsrc = −Gdet a full linear dispersion compensation can occur (blue goes to blue) and intrinsic Rowland resolution is achieved.

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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