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Figure 4
Expanded DuMond diagram for two identical crystals in which the second crystal is rotated by ψ about its incident beam with respect to the first. For ranges of χ under 1 mrad and small ranges of θ, the traces of the crystals may be treated as planes as shown here. The thick dark line shows the wavelengths, in-plane angles θ and out-of-plane angles χ that are selected by both crystals. For ψ = 0° and ψ = 180° this diagram yields, respectively, the non-dispersive and dispersive configurations shown in Fig. 2[link]. Note that ψ in this figure is simply related to φ as defined in Fig. 1[link] and equations (1)[link]–(4)[link], ψ = φ − 90°.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 3| March 2012| Pages 408-416
doi:10.1107/S0909049512009272
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