The moving-beam diffraction geometry: the DIAD application of a diffraction scanning probe

Leonardi, A.; James, A.; Reinhard, C.; Drakopoulos, M.; Williams, B.; Dehyle, H.; Filik, J.; Perera, L.; Ahmed, S.

doi:10.1107/S1600576725009811

Journal of Applied Crystallography Journal of Applied
Crystallography

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Figure 4
Effect of moving the diffraction beam on the scattering observation. Scattering-momentum error $[\Delta Q = \left|\Delta {\bf q}\right|]$ for a detector pixel on the first sphere octant arising from a 0.5 mm beam offset along x. The error is shown for the sample-to-detector distances of (A)–(D) 330 mm and (E), (F) 600 mm, assuming 20 keV radiation (0.619924 Å) and the McStas reference system (i.e. the incident radiation is parallel to z). (C)–(F) The relative error $[\Delta Q/Q]$ is independent of the radiation energy. The data in the upper and bottom rows differ only in the projection bases [(A), (C) and (E)] n_x–n_z and [(B), (D) and (F)] n_y–n_z, respectively. The scattering momentum Q varies from 0 to ∼14 Å⁻¹ with n_z from 1.0 to 0.0 (i.e. Q is independent of n_x and n_y).

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 59| Part 1| February 2026| Pages 12-27

https://doi.org/10.1107/S1600576725009811

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