Abstract
Gaussian-like shaping of the forward-diffracted intensity was observed from an initially rectangular cross-section of coherent X-rays. The effect occurs when a coherent X-ray wavelength inside a crystal exactly matches the period of atomic net planes lying perpendicular to the incident beam. The transmitted peak intensity rose when the lateral width of the rectangular-shaped incident beam increased. The transmitted Gaussian-like shaped intensity profile was significantly narrower than that of the incident beam size. The observations showed that coherent and incoherent X-rays produced different dependences of the peak intensity and its width on the incident beam size.
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