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D-91 Characterizing X-ray Mirrors in Reciprocal Space: Results from the NIST X-ray Optics Evaluation Double-Crystal Diffractometer

In the last decade, multilayer x-ray optics have rapidly become ubiquitous on laboratory instruments. Parabolic graded multilayers, in particular, decrease beam divergence and so can dramatically increase the intensity of the source for many experiments. Although the spatial profiles produced by these multilayers have been studied by simulation methods and by observing the beam, their energy/divergence characteristics are less well-known. A study using a single-axis diffraction experiment has shown that for high-accuracy lattice parameter determination these effects must be taken into account.[1]