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. 2014 Jun 23;5:4219. doi: 10.1038/ncomms5219

Figure 4. UHRIX resolution functions.

Figure 4

(a) Momentum transfer resolution ΔQ of the UHRIX instrument measured by the analyser system rotated about y axis with angle ϕy. Open circles: ΔQ=0.49 nm−1, corresponding to the collimating mirror and CDFDW optics being fully open. Solid circles: ΔQ=0.25 nm−1, with a horizontal aperture installed after the collimating Montel optics, to reduce the solid angle of the analyser system acceptance. (b) UHRIX spectral resolution functions measured by scanning the CDDW monochromator energy. Light purple solid circles: the analyser system is at ϕy=0 intercepting the direct focused monochromatic X-ray beam. Dark purple open circles: the analyser system is at ϕy=21.6 mrad (Q=1 nm−1) intercepting X-rays scattered from a strong elastic scatterer, glassy carbon. The black solid line is the convolution of the theoretical spectral functions of the CDDW and CDFDW optics calculated using multi-crystal dynamical theory of X-ray diffraction. Other functions with the same FWHM are shown for comparison: dashed green line—Gaussian; blue dash-dotted line—Lorentzian.