Digital electron diffraction--seeing the whole picture.

IF 1.8 4区 材料科学
Acta Crystallographica Section A Pub Date : 2013-07-01 Epub Date: 2013-05-21 DOI:10.1107/S0108767313010143
Richard Beanland, Paul J Thomas, David I Woodward, Pamela A Thomas, Rudolf A Roemer
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引用次数: 14

Abstract

The advantages of convergent-beam electron diffraction for symmetry determination at the scale of a few nm are well known. In practice, the approach is often limited due to the restriction on the angular range of the electron beam imposed by the small Bragg angle for high-energy electron diffraction, i.e. a large convergence angle of the incident beam results in overlapping information in the diffraction pattern. Techniques have been generally available since the 1980s which overcome this restriction for individual diffracted beams, by making a compromise between illuminated area and beam convergence. Here a simple technique is described which overcomes all of these problems using computer control, giving electron diffraction data over a large angular range for many diffracted beams from the volume given by a focused electron beam (typically a few nm or less). The increase in the amount of information significantly improves the ease of interpretation and widens the applicability of the technique, particularly for thin materials or those with larger lattice parameters.

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数码电子衍射——看到全貌。
会聚束电子衍射在几纳米尺度上的对称性测定的优点是众所周知的。在实际应用中,由于高能电子衍射的小布拉格角限制了电子束的角度范围,即入射光束的大会聚角会导致衍射图中的信息重叠,这种方法经常受到限制。自20世纪80年代以来,通过在照射面积和光束收敛之间做出妥协,技术已经普遍可用,克服了单个衍射光束的这一限制。这里描述了一种简单的技术,它克服了所有这些问题,使用计算机控制,从聚焦电子束给出的体积(通常是几纳米或更小)中获得许多衍射光束在大角度范围内的电子衍射数据。信息量的增加大大提高了解释的便利性,并扩大了该技术的适用性,特别是对于薄材料或晶格参数较大的材料。
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
自引率
11.10%
发文量
0
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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