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Figure 1
The Bragg scattering geometry of the experiment. ki is the incident wavevector, kf is the diffracted wavevector and kf − ki is the scattering vector. ki and kf define the scattering plane and k⊥ is the vector perpendicular to that plane. Rotation of the crystal around ki (a) corresponds to motion of the Bragg peak around the Debye–Scherrer cone and rotation around k⊥ (b) corresponds to motion of the Bragg peak across the powder ring. Rotational around the scattering vector kf − ki (c) is not observable.

IUCrJ
Volume 1| Part 3| April 2014| Pages 172-178
ISSN: 2052-2525
doi:10.1107/S2052252514006022