Journal: Nature Communications

Article Title: High-contrast sub-millivolt inelastic X-ray scattering for nano- and mesoscale science

doi: 10.1038/ncomms5219

Figure Lengend Snippet: ( a ) Momentum transfer resolution Δ Q of the UHRIX instrument measured by the analyser system rotated about y axis with angle ϕ y . Open circles: Δ Q =0.49 nm −1 , corresponding to the collimating mirror and CDFDW optics being fully open. Solid circles: Δ Q =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 ϕ y =0 intercepting the direct focused monochromatic X-ray beam. Dark purple open circles: the analyser system is at ϕ y =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.

Article Snippet: The collimating Montel optics, manufactured by Incoatec GmbH, consisted of two parabolically shaped, 120-mm-long surfaces coated with laterally graded 100 W–C bilayers (Göbel mirrors), arranged perpendicularly and side-by-side .

Techniques: Comparison