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Figure 2
Illustration for SPIND auto-indexing algorithm. (a) A diffraction pattern recorded by Cornell-SLAC hybrid Pixel Array Detector (CSPAD) (Herrmann et al., 2013BB16; Hart et al., 2012BB14), with a few exaggerated peaks for illustrative purposes. Five peaks are selected to form ten vector pairs. The vector lengths, ratio of lengths and angles between the vectors are then calculated for the ten pairs for matching with a reference based on a priori knowledge of the unit cell (within some mismatch tolerance). (b) Rejection module for eliminating spurious solution candidates, based on the constraint that all peak pairs share the same crystal orientation. The solution must lie in the intersection of the solution pools, provided that the peaks are from a single crystal.

IUCrJ
Volume 6| Part 1| January 2019| Pages 72-84
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518014951