Results of an experimental and theoretical analysis are presented, concerning the six‐beam (220/242/044/―224/―202) diffraction of X‐rays in thick perfect Ge crystals, under the conditions when a part of the diffracted beams is Bragg reflected. Three cases are considered, when one, three, or all five diffracted beams are Bragg reflected. It is shown theoretically that an enhancement of anomalous transmission for the Laue beams takes place in all these cases. Experimentally this effect is observed in the third case on the incident beam topogram, when the two‐beam Borrmann effect corresponds to Bragg reflection and is more weakly revealed than in the Laue case. Experimentally as well as theoretically an unusual behaviour of the integral intensity for the (044) beam is observed, when the number of Bragg beams varied from one to five.
A method for the measurement of the effective absorption coefficient for the case of many‐wave X‐ray diffraction is proposed based on the utilization of a double‐block crystal in many‐wave configurations, where one of the reflections is being forbidden. Due to the diffraction on the first block (the collimator) a beam corresponding to the forbidden reflection arises. It is truly many wave and is not accompanied by the non‐desired two‐wave background. On the base of many‐wave scattering dynamic theory, equations are obtained for integrated intensity in a double‐block crystal. Quantitative comparison of the theory and experiment is carried out for the case of (111/200) three‐wave diffraction of CuKα radiation in Ge crystal.
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