view article
Figure 3
Schematic view of wide-angle and small-angle regimes and of the notation used in this paper for the momentum vectors. The momentum transfer [{\bf q}] is defined as the difference between the incoming wavevector [{\bf k}_{0}] and the scattering vector [{\bf k}]. [{\bf q}] can be decomposed into its axial component [{\bf q}_{z}], i.e. the component parallel to the incoming radiation assumed to travel along the z axis, and [{\bf q}_{xy}]. The wide-angle regime is depicted in (a), where the axial component [{\bf q}_{z}] is non-negligible thanks to the large scattering angle θ. For comparison, (b) shows the same scheme in the small-angle regime, where the scattering angle θ is sufficiently small to neglect the axial component of [{\bf q}]. In both (a) and (b) the Ewald sphere is shown in gray.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 55| Part 5| October 2022| Pages 1232-1246
https://doi.org/10.1107/S1600576722008068
Follow J. Appl. Cryst.
Sign up for e-alerts
E-alerts
Follow J. Appl. Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS