Abstract
It has experimentally and theoretically been confirmed that the intensity ratio rh of Friedel pair reflexions h and {\bar {\bf h}} is given by |Fh|2/|F_{{\bar {\bf h}}}2 in a perfect crystal as well as in a mosaic crystal both in the symmetrical Bragg case and in the symmetrical Laue case. The measurements have been carried out on a nearly perfect GaAs crystal plate in the energy range near the As K absorption edge by the use of the energy-dispersive diffractometer and continuous radiation. These results have shown, a reasonable agreement with the relevant theoretical curves. The limitation of the above relation in tile presence of extinction effects has been considered.
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