Extinction in the framework of transfer equations for general-type crystals

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