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Dynamical effects in the integrated X-ray scattering intensity from imperfect crystals in Bragg diffraction geometry. I. Semi-dynamical model.
Acta Crystallographica Section A: Foundations and Advances ( IF 1.8 ) Pub Date : 2020-01-01 , DOI: 10.1107/s2053273319014281
V B Molodkin 1 , S I Olikhovskii 1 , S V Dmitriev 1 , A I Nizkova 1 , V V Lizunov 1
Affiliation  

The analytical expressions for the coherent and diffuse components of the integrated reflection coefficient are considered in the case of asymmetric Bragg diffraction geometry for a single crystal of arbitrary thickness, which contains randomly distributed Coulomb-type defects. The possibility to choose the combinations of diffraction conditions optimal for characterizing defects of several types by accounting for dynamical effects in the integrated coherent and diffuse scattering intensities, i.e. primary extinction and anomalous absorption, has been analysed based on the statistical dynamical theory of X-ray diffraction by imperfect crystals. The measured integrated reflectivity dependencies of the imperfect silicon crystal on azimuthal angle were fitted to determine the diffraction parameters characterizing defects in the sample using the proposed formulas in semi-dynamical and semi-kinematical approaches.

中文翻译:

布拉格衍射几何中来自不完美晶体的积分X射线散射强度的动力学效应。一,半动力学模型。

对于包含任意分布的库仑型缺陷的任意厚度的单晶,在非对称布拉格衍射几何结构的情况下,应考虑积分反射系数的相干分量和扩散分量的解析表达式。基于X射线统计动力学理论,已经分析了通过考虑整体相干和扩散散射强度(即初始消光和反常吸收)中的动力学效应来选择表征几种类型缺陷的最佳衍射条件组合的可能性不完美晶体的衍射。
更新日期:2020-01-07
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