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Figure 2
Horizontal divergence. (a) Because of the angle between the horizontal (dash–dotted line) and a ray of a beam (orange) with non-zero horizontal divergence [\Theta_{\rm D}], the incident angle is effectively lowered from [\alpha_{\rm i}] to [\alpha_{\rm eff}]. The effective angle can be calculated from the ray vector [{\bf r}] and the tangent plane normal [{\bf n}]. (b) Deviation of qzeff from qz for two different horizontal divergence values. The effect is most pronounced for large qz. (c) Deviation of qzeff from qz depending on divergence for a relatively high value of qz = 2 Å−1.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 2| March 2018| Pages 432-438
https://doi.org/10.1107/S1600577517018057
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