Phase of transmitted wave in dynamical theory and quasi-kinematical approximation

O. Yu. Gorobtsov; I. A. Vartanyants

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Phase of transmitted wave in dynamical theory and quasi-kinematical approximation

机译：动力学理论中的透射波相位和准运动学近似

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Variation of the phase of the beam transmitted through a crystalline material as a function of the rocking angle is a well-known dynamical effect in x-ray scattering. Unfortunately, it is not so easy to directly measure these phase variations in a conventional scattering experiment. It was recently suggested that the transmitted phase can be directly measured in ptychography experiments performed on nanocrystal samples. Results of such experiment for different crystal thickness, reflections, and incoming photon energies, in principle, can be fully described in the frame of dynamical theory. However, dynamical theory does not provide a simple analytical expression for the further analysis. Here we develop a quasi-kinematical theory approach that allows one to correctly describe the phase of the transmitted beam for the crystal thickness less than extinction length that is beyond applicability of the conventional kinematical theory.

机译：通过晶体材料的光束的相位随摇摆角的变化是x射线散射中众所周知的动力学效应。不幸的是，在常规的散射实验中直接测量这些相位变化并不容易。最近有人提出，可以在对纳米晶体样品进行的气相色谱实验中直接测量透射相。原则上，可以在动力学理论的框架中充分描述针对不同晶体厚度，反射和入射光子能量的此类实验的结果。但是，动力学理论并未为进一步分析提供简单的分析表达式。在这里，我们开发了一种准运动学理论方法，该方法可以正确描述透射光束的晶体厚度小于消光长度的透射光束的相位，这超出了常规运动学理论的适用范围。

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《Physical review》 |2016年第18期|184107.1-184107.11|共11页
作者
O. Yu. Gorobtsov; I. A. Vartanyants;
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Deutsches Elektwnen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany,National Research Centre 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia;

Deutsches Elektwnen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany,National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409 Moscow, Russia;

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机译：动力学理论中的透射波相位和准运动学近似

Phase of transmitted wave in dynamical theory and quasi-kinematical approximation

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