Bent perfect crystals as X-ray focusing polychromators in symmetric Laue geometry.

IF 1.8 4区材料科学

Acta Crystallographica Section A Pub Date : 2013-01-01 Epub Date: 2012-11-30 DOI:10.1107/S0108767312044601

J P Guigay, C Ferrero, D Bhattacharyya, O Mathon, S Pascarelli

引用次数: 4

Abstract

The focusing properties of cylindrically bent crystals in symmetric Laue geometry are discussed using the formalism of Fresnel diffraction and the analytical solution of the Takagi-Taupin equations for a point source on the entrance surface. The existence of a focal shift in the dynamical focusing effect is pointed out and discussed. The present theoretical framework is applied to experiments performed at the energy-dispersive X-ray absorption spectroscopy beamline of the European Synchrotron Radiation Facility concerning the position and the size of the focal spot obtained from a polychromatic source at a large distance from the bent crystal.

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弯曲完美晶体作为x射线聚焦多色器在对称劳几何。

利用菲涅耳衍射的形式和入口表面点源的Takagi-Taupin方程的解析解，讨论了对称劳埃几何中圆柱弯曲晶体的聚焦特性。指出并讨论了动态聚焦效应中焦移的存在。本文将该理论框架应用于欧洲同步辐射装置的能量色散x射线吸收光谱束线上的实验，研究了从距离弯曲晶体较远的多色源获得的焦斑的位置和大小。

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.