IRIXS Spectrograph: an ultra high-resolution spectrometer for tender RIXS

Bertinshaw, J.; Mayer, S.; Dill, F.-U.; Suzuki, H.; Leupold, O.; Jafari, A.; Sergueev, I.; Spiwek, M.; Said, A.; Kasman, E.; Huang, X.; Keimer, B.; Gretarsson, H.

doi:10.1107/S1600577521003805

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Figure 3
(a) Schematic diagram of the spectrograph. For simplicity the horizontal components of the Montel mirrors are omitted. Photons scattered from a sample are collected and collimated by a Montel mirror (M_C) before being further collimated (C) and dispersed (D) by two Ge(111) crystals with asymmetry angles α₂ = −38.8° (b₂ = −1/18) and α₃ = −α₂ (b₃ = −18). The acquired energy dispersion of the beam is then mapped onto a position-sensitive detector using a focusing Montel mirror (M_F). This effect is presented as red, green and blue lines hitting the detector at three different positions. Ray-tracing simulations follow the phase space of photons at positions marked with black lines: (b) non-dispersive photons exiting M_C, (c) after the C-crystal, which introduces a dispersion rate $[{\cal D}_{\rm{C}}]$ = 0.3 µrad meV⁻¹, and (d) after the D-crystal, where the dispersion rate increases to $[{\cal D}_{\rm{D}}]$ = 11 µrad meV⁻¹.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 28| Part 4| July 2021| Pages 1184-1192

https://doi.org/10.1107/S1600577521003805

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