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An x-ray fluorescence microprobe with linear Bragg-Fresnel lens was tested at the European Synchrotron Radiation Facility Microfocus beamline. A focal line with a width of 0.8 μm was observed using the knife-edge technique at a wavelength of 0.85 Å (14.6 eV). Wiener filtering with the Fast Fourier Transformation was applied to solve a convolution equation to evaluate the size of the probe from fluorescence data.
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Kuznetsov et al. (1994) studied this question.
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