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Figure 1
(a) A schematic ray diagram for precession electron diffraction (PED), illustrating the rocking/de-rocking action of the beam before and after the specimen. (b)–(e) Illustrations of how precession alters the recorded diffracted intensities, here from the [001] zone axis of Er2Ge2O7: (b) without precession, (c) with a precession angle of 20 mrad, (d) with a precession angle of 47 mrad. The pattern of diffracted intensities seen in (d) is similar to that seen in the kinematic simulation shown in part (e).

IUCrJ
Volume 2| Part 1| January 2015| Pages 126-136
ISSN: 2052-2525
doi:10.1107/S2052252514022283