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Figure 4
Oscillation limit ωhkl as function of X-ray wavelength or photon energy. A Z-cut α-quartz perpendicular to the X-ray beam can oscillate ±ωhkl before reflection (hkl) occurs. The black curve is a typical wavelength normalization obtained at BioCARS 14-ID-B beamline of APS, which is a good representation of the incident spectrum of the X-ray beam. If a monochromatic wavelength is selected near the peak, the quartz chip can oscillate ±6° without producing a Bragg reflection up to a resolution of 1.54 Å from the quartz crystal.

IUCrJ
Volume 7| Part 6| November 2020| Pages 1009-1018
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520011288