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Figure 4
Orientation of the laminar grating close to the extreme off-plane configuration for horizontal beam deflection. The drawing is not shown to scale. The X-rays travel from left to right. For any source point on the left semi-arc all diffracted orders will be found on the right semi-arc with identical opening angle γ. The upper figure presents the angle convention as usually used in connection with the off-plane configuration, with α and β being the orientation angles on the arc of the incident and of the diffracted beam, respectively. In the lower figure rectangular coordinates are used. The angle of grazing incidence is denoted θ, while the orientation angle of the grooves with respect to the specularly reflected beam is ψ. φ and ϑ are the positions of a diffracted order with respect to the plane, which is perpendicular to the surface and parallel to the grooves.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 91-97
doi:10.1107/S1600577515019761
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