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Figure 1
The atomic scattering factor describes the coherent scattering of X-rays from a given atom. This has two additive components (equation 1[link]): the normal component, f0, from Thomson scattering decreases smoothly with the Bragg angle θ but has no intrinsic dependence on the wavelength, and the anomalous component, fΔ, from resonance with electron transitions has a sharp dependence on the wavelength λ near absorptive transitions but is nearly constant with respect to the scattering angle. Adapted from Box 1 of Hendrickson (1991BB84) with permission from AAAS.

IUCrJ
Volume 10| Part 5| September 2023| Pages 521-543
ISSN: 2052-2525
https://doi.org/10.1107/S2052252523006449