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. 2015 Aug 25;71(Pt 9):1799–1811. doi: 10.1107/S1399004715011803

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© Kroon-Batenburg et al. 2015

This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Ewald construction for a rotation experiment. An incident X-ray beam k ₀ with length 1/λ is reflected by a series of net planes in the direction k ₁ if the corresponding reciprocal-lattice vector coincides with the Ewald sphere. In an arbitrary orientation of the crystal lattice is not in a reflecting position but can be rotated around the spindle axis so that the Bragg condition is met and makes an angle of 90° − θ with the X-ray beam k ₀.

Inline graphic — Ewald construction for a rotation experiment. An incident X-ray beam k ₀ with length 1/λ is reflected by a series of net planes in the direction k ₁ if the corresponding reciprocal-lattice vector coincides with the Ewald sphere. In an arbitrary orientation of the crystal lattice is not in a reflecting position but can be rotated around the spindle axis so that the Bragg condition is met and makes an angle of 90° − θ with the X-ray beam k ₀.