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Schematic of the optical elements used in a STXM equipped with an annular quadrant detector (AQD). The central stop (CS) and order-sorting aperture (OSA) block essentially all x-rays except those focused in the first diffraction order of the objective, a zone plate (ZP) lens. The specimen is scanned in the focal plane. The measured intensities can be used to determine the absorption and deflection of the beam imparted by the specimen.
