Abstract
An improvement of the classical theory of extinction in mosaic crystals is made by starting from the energy transfer equations valid for a general-type crystal according to Zachariasen's [Acta Cryst. (1967), 23, 558-564] classification. Within the assumption that only the integrated intensity of the diffraction peak is needed, the equations are first simplified and then solved. The result obtained for the extinction factor is similar to that of Becker & Coppens [Acta Cryst. (1974), A30, 129-147], but two new parameters appear if the crystal is not of type I. One of them, determining the peculiarity of the transfer equations, gives differences in the extinction factor not greater than 8%. The other, representing the ratio of the kinematical cross-section strengths along the diffracted and incident beams, gives differences up to 50%. For crystals of ellipsoidal shape, empirical formulae appropriate for structure refinement programs are proposed.
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