环形孔径静电校正系统的性能。

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2019-11-11 DOI:10.1093/jmicro/dfz035

T. Kodama, T. Kawasaki, T. Ikuta

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引用次数: 0

摘要

从理论上研究了圆孔和环形孔径电子显微镜的成像。孔径——圆孔孔径相对于环形孔径是负的——产生额外的静电场，该静电场在指向光轴的电子上施加力。所产生的偏转角随着离光轴距离的增加而减小。这种静电场导致圆形电子透镜不可避免的球面像差的校正效果；朝向光轴的偏转随着离光轴的距离的增加而比线性地增加得更强。给出了圆孔和环形孔径校正效果的解析公式。这些表达式基于戴维森-卡尔比克公式，该公式用于计算简单静电透镜的焦距。

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Properties of electrostatic correcting systems with annular apertures.

Image formation in electron microscopes with circular hole and annular apertures is studied theoretically. The apertures-the circular hole aperture being negative with respect to the annular aperture-produce an additional electrostatic field that exerts a force on the electrons directed toward the optical axis. The resulting deflection angle decreases with increasing distance from the optical axis. This electrostatic field results in a correcting effect of the unavoidable spherical aberration of round electron lenses; the deflection toward the optical axis increases stronger than linearly with increasing distance from the optical axis. Analytical formulae are given for the correcting effect of circular hole and annular apertures. The expressions are based on the Davisson-Calbick formula, which is used to calculate focal length of a simple electrostatic lens.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.