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Figure 1
Ewald construction for a rotation experiment. An incident X-ray beam k0 with length 1/λ is reflected by a series of net planes in the direction k1 if the corresponding reciprocal-lattice vector [{\bf d}_{hkl}^*] coincides with the Ewald sphere. In an arbitrary orientation of the crystal lattice [{\bf d}_{hkl}^*] is not in a reflecting position but can be rotated around the spindle axis so that the Bragg condition is met and [{\bf d}_{hkl}^*] makes an angle of 90° − θ with the X-ray beam k0.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 71| Part 9| August 2015| Pages 1799-1811
doi:10.1107/S1399004715011803
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