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Figure 1
Ewald construction for a rod scan, as used in grazing-incidence diffraction. The top inset displays the four relevant scattering angles α, ψ, β and φ, while the bottom figure shows the scattering vectors and the Ewald sphere. When the exit wavevector kf moves up a scattering rod, it has to follow the intersection of the Ewald sphere with a cylinder defined by the requirement that the length of the in-plane scattering vector Q stays fixed. The incident wavevector ki was chosen parallel to the surface for convenience; however, the formulae provided in the text cover the general situation.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 6| October 2005| Pages 807-811
doi:10.1107/S0909049505030815
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