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Figure 2
(a) SANS in a powder sample before and after Bragg diffraction at a crystallite. (b) A single Bragg diffraction event at a crystallite. L1,2 are the path lengths in the precession field B. L is the width of the field area B0. α1,2 are the SANS angles. θ0 and θ2 are the angles of the trajectories with the field boundaries, and θ1 is the Bragg angle. η is the angle between the field boundary and the diffracting lattice plane. The signs of θ0, θ1 and θ2 are positive. α1, α2 and η have a negative sign for clockwise rotation, as shown in the sketch.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 53| Part 1| February 2020| Pages 88-98
https://doi.org/10.1107/S160057671901611X
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