Correction properties of electron mirrors
Correction properties of electron mirrors
复制标题
电子镜的校正特性
DOI：
10.1093/oxfordjournals.jmicro.a023484
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
H. Rose
中科院分区：
文献类型：
--
作者：
D. Preikszas;H. Rose
电子镜能够校正旋转对称透镜的初级球差和色差。校正系统的分辨率受到高阶轴向像差的限制，高阶轴向像差是通过依赖于时间的微扰过程来确定的。这种形式主义允许一个旋转对称的电磁电子镜的几何像差计算到任意阶。考虑了相对论效应。在时间上的对称性相对于转折点被用来减少数值积分的数量。此外，还给出了球差和轴向色差系数的解析公式。通过两个实际算例说明了修正特性。
Electron mirrors are capable of correcting the primary spherical and chromatic aberration of rotationally symmetric lenses. The resolution of corrected systems is limited by the higher-order axial aberrations which are determined by means of a time-dependent perturbation procedure. This formalism allows one to calculate the geometric aberrations of a rotationally symmetric electromagnetic electron mirror up to arbitrary order. Relativisric effects are taken into account. The symmetry in time with respect to the turning point is utilized to reduce the number of numerical integrations. In addition analytical formulae are given for the coefficients of the spherical and the axial chromatic aberration. The correction properties are illustrated by means of two realistic examples.