Within the framework of an earlier proposed method the dynamical diffraction of X‐rays, neutrons, electrons, and other charged particles by ordered alloys are considered theoretically. Anomalous transmission, pendellösung patterns, intensity jumps near the absorption edges for fundamental and superlattice reflections, and channeling of fast particles are discussed. The influence of the long‐range order and other characteristics of alloys on these dynamical effects are clarified.

The instrumental effect on the measured Laue‐diffracted intensities is theoretically studied for a single‐crystal spectrometer (SCS). The calculated parameters A and B entering the relation In S  A t + B between the logarithm of intensity jumps (S  i2/i1) and the crystal thickness are in agreement with those measured near the absorption K‐edges of Ga and As at different reflections (hkl). The influence of wave fields with different polarizations on these parameters is also considered. It is shown both theoretically and experimentally that at a transition from (III) to (III) Laue reflections the quantity A which corresponds to absorption processes, is unchanged while the parameter B describes the intensity jumps fairly well.

No abstract