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Figure 2
Diffraction from two-dimensional crystals. (a, b) Example diffraction images at 5° and 20° tilt angle, respectively. The circles are drawn at 50, 10 and 6 Å resolution. In (a), the detector-plane position in polar coordinates (rD, φD) of a peak is superimposed. (c) Three-dimensional reciprocal space with a Bragg rod ha* + kb* + [q_{\rm rod}\hat{\bf q}_{\rm rod}] represented as a thick red line. (d) Ewald sphere construction for the diffraction process. The incoming and diffracted wavevectors are labeled ki and kf, respectively. The diffracted beam is generated by the red dot on the Bragg rod. The diffraction angle of the Bragg peak on the detector (blue dot) has scattering angle 2θ. The sample plane with tilt angle η is represented in green.

IUCrJ
Volume 6| Part 1| January 2019| Pages 34-45
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518014641