Width of the Darwin Table for Forbidden Reflections.
It is shown that reflections with structure factor equal to zero are not absent, but have very small Darwin table width, which is determined by a shift of the Bragg point and by structure factors of another type. It is pointed out that this effect cannot be obtained within the Ewald theory of dynamical diffraction on single crystals. {copyright} {ital 1996 The American Physical Society.}