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Figure 2
Scheme of the CCF calculation in the case of 2D (a) and 3D (b) intensity distributions. The product of intensities at two points q1 and q2 in reciprocal space, separated by the angle Δ, contribute into the CCF value at this Δ value. The final CCF is obtained by averaging over all points on the rings/spheres of the corresponding radii. The color code exemplarily represents the simulated intensities for a colloidal crystal with an f.c.c. structure: (a) 2D diffraction pattern from the colloidal crystal oriented along the [001]f.c.c. axis with respect to the incident X-ray beam and (b) intensities at the spheres in 3D reciprocal space of the colloidal crystal with the radii q1 and q2, corresponding to the 111 and 220 reflections, respectively.

IUCrJ
Volume 9| Part 4| July 2022| Pages 425-438
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522004250