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利用晶体材料散射电子的实空间分布进行原子分辨率成像。

Atomic resolution imaging using the real-space distribution of electrons scattered by a crystalline material.

作者信息

Lazar Sorin, Etheridge Joanne, Dwyer Christian, Freitag Bert, Botton Gianluigi A

机构信息

FEI Electron Optics, Achtseweg Noord 5, Eindhoven, 5600 KA, The Netherlands.

出版信息

Acta Crystallogr A. 2011 Sep;67(Pt 5):487-90. doi: 10.1107/S0108767311020708. Epub 2011 Jul 6.

Abstract

We present an alternative atomic resolution incoherent imaging technique derived from scanning transmission electron microscopy (STEM) using detectors in real space, in contrast to conventional STEM that uses detectors in diffraction space. The images obtained from various specimens have a resolution comparable to conventional high-angle annular dark-field (HAADF) STEM with good contrast, which seems to be very robust with respect to thickness, focus and imaging conditions. The results of the simulations are consistent with the experimental results and support the interpretation of the real-space STEM image contrast as being a result of aberration-induced displacements of the high-angle scattered electrons.

摘要

我们提出了一种源自扫描透射电子显微镜(STEM)的替代原子分辨率非相干成像技术,该技术在实空间中使用探测器,这与在衍射空间中使用探测器的传统STEM形成对比。从各种样品获得的图像具有与传统高角度环形暗场(HAADF)STEM相当的分辨率,且对比度良好,在厚度、聚焦和成像条件方面似乎非常稳健。模拟结果与实验结果一致,并支持将实空间STEM图像对比度解释为由高角度散射电子的像差诱导位移导致的这一观点。

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