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<p>with an <a href="page.php?w=Ewald%27s_sphere">Ewald's sphere</a> construction used to represent that there is no change in energy during the diffraction process. For matter waves a similar but slightly different approach is used based upon a relativistically corrected form of the <a href="page.php?w=Schr%C3%B6dinger_equation">Schrödinger equation</a>, as first detailed by <a href="page.php?w=Hans_Bethe">Hans Bethe</a>. The Fraunhofer and Fresnel limits exist for these as well, although they correspond more to approximations for the matter wave</p><p>
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