On the alignment for precession electron diffraction.

On the alignment for precession electron diffraction.
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DOI:
10.1016/j.ultramic.2012.03.021
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发表时间:
2012-06
期刊:
影响因子:
2.2
通讯作者:
Marks, Laurence D.
Marks, Laurence D.
中科院分区:
工程技术3区
文献类型:
--
作者:
Liao, Yifeng;Marks, Laurence D.

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进动电子衍射作为一种解决晶体结构的技术,以及传统的选择区域和会聚束衍射方法的替代方法,已经得到了迅速的发展。旋进的关键问题之一是枢轴点对准,因为固定的视光束不能保证固定的枢轴点。大的进动倾角,加上场前和场后的不对准,会引起像平面的偏移。本文指出,在振荡过程中,光束应对准场前光轴,以保持电子照明的静止。提出了一种实用的对准方法,其重点是将光束在试样上的偏移最小化,并演示了(110)取向硅单晶和铸造钴铬钼合金中的碳化物相(尺寸约为20 nm)。
Precession electron diffraction has seen a fast increase in its adoption as a technique for solving crystallographic structures as well as an alternative to conventional selected-area and converged-beam diffraction methods. One of the key issues of precession is the pivot point alignment, as a stationary apparent beam does not guarantee a fixed pivot point. A large precession tilt angle, along with pre-field and post-field misalignment, induces shift in the image plane. We point out here that the beam should be aligned to the pre-field optic axis to keep the electron illumination stationary during the rocking process. A practical alignment procedure is suggested with the focus placed on minimizing the beam wandering on the specimen, and is demonstrated for a (110)-oriented silicon single crystal and for a carbide phase (~20 nm in size) within a cast cobalt–chromium–molybdenum alloy.
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