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Figure 1
The X-ray source, S, and the focus point, I (polychromatic image), are located at the two focuses of the ellipse. a and b are the half-axis lengths. The curved polychromator is centred at point P. p is the source-to-crystal distance and q is the crystal-to-polychromatic focus distance. θB is the Bragg angle. The two coordinate systems (x,y) and (X,Y) described in the text are explicitly shown. At the energy-dispersive XAS beamline at the ESRF (ID24), p = 29.7 m and q can be adjusted from 0.5 to 1.5 m. Obviously the figure is not drawn to scale.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 5| Part 5| September 1998| Pages 1250-1257
https://doi.org/10.1107/S0909049598004002
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