Dynamical diffraction effect in a curved multi-plate crystal cavity.

IF 1.8 4区材料科学 Acta Crystallographica Section A Pub Date : 2012-11-01 Epub Date: 2012-10-05 DOI:10.1107/S0108767312034319

Y Y Chang, Y W Tsai, Y H Wu, M T Tang, S L Chang

引用次数: 1

Abstract

A modified algorithm for X-ray dynamical diffraction theory is presented for curved boundary crystals and a detailed description of the numerical procedure is given. The simulated and experimental results both show an anomalous focusing behavior in a curved multi-plate crystal cavity of silicon under the (12,4,0) back-diffraction condition at a photon energy of 14.4388 keV. The focusing effects are analyzed, within the framework of the dynamical theory of X-ray diffraction, from the excitation of the dispersion surface and modification of the index of refraction with respect to the non-plane-parallel boundaries of a curved crystal cavity.

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弯曲多片晶体腔中的动态衍射效应。

提出了一种改进的弯曲边界晶体x射线动态衍射理论算法，并给出了数值计算过程的详细说明。模拟和实验结果均表明，光子能量为14.4388 keV时，在(12,4,0)反向衍射条件下，硅弯曲多板晶体腔中存在异常聚焦行为。在x射线衍射动力学理论的框架下，从色散面的激发和折射率相对于弯曲晶体腔非平面平行边界的改变两方面分析了聚焦效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Crystallographica Section A 化学-晶体学

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Acta Crystallographica Section A: Foundations and Advances publishes articles reporting advances in the theory and practice of all areas of crystallography in the broadest sense. As well as traditional crystallography, this includes nanocrystals, metacrystals, amorphous materials, quasicrystals, synchrotron and XFEL studies, coherent scattering, diffraction imaging, time-resolved studies and the structure of strain and defects in materials. The journal has two parts, a rapid-publication Advances section and the traditional Foundations section. Articles for the Advances section are of particularly high value and impact. They receive expedited treatment and may be highlighted by an accompanying scientific commentary article and a press release. Further details are given in the November 2013 Editorial. The central themes of the journal are, on the one hand, experimental and theoretical studies of the properties and arrangements of atoms, ions and molecules in condensed matter, periodic, quasiperiodic or amorphous, ideal or real, and, on the other, the theoretical and experimental aspects of the various methods to determine these properties and arrangements.

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