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www.chem.ufl.edu/%7Eitl/2045/lectures/lec_h.html. www.msm.cam.ac.uk/.../powder.php.
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Reproduction of a page from W L Bragg’s notebook, c.1913At the top of this page from one of W L Bragg’s early notebooks is a diffraction pattern. The dark spot at the centre is made by the X-ray beam; the diffraction of the beam by the crystal creates the surrounding dots.