Abstract
AbstractA new x‐ray optical system for the fluorescence beamline L at HASYLAB is currently under construction and its commissioning phase will start early in 2001. Basis elements of the optical system are a double single‐crystal — double multilayer monochromator, x‐ray mirrors and capillary optics. The high‐resolution Si crystal monochromator is designed for microscopic x‐ray absorption near‐edge structures (µ‐XANES) experiments in fluorescence mode for laterally resolved speciation of trace elements. Broadband excitation by the multilayer monochromator will be used in total reflection x‐ray fluorescence (TXRF) experiments and microscopic x‐ray fluorescence analysis (µ‐XRF). An energy range of 2.4–80 keV will be explored by the monochromator system, giving access to the K‐edges of elements with 16 < Z < 79. A set of plane and cylindrical x‐ray mirrors allows a high‐energy cut‐off at 12 and 30 keV, respectively and optional prefocusing. The microfocus is generated by monocapillaries and polycapillaries. The performance of different monocapillary optics in the synchrotron beam was measured in polychromatic and monochromatic modes. Copyright © 2001 John Wiley & Sons, Ltd.
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