均匀场磁扇形的二阶像差校正。

Correction of the second-order aberrations of uniform field magnetic sectors.

作者信息

Shuman H

出版信息

Ultramicroscopy. 1980;5(1):45-53. doi: 10.1016/0304-3991(80)90010-8.

Abstract

The focusing equations for uniform field magnetic sectors with circular edges are shown to have second-order double focusing solutions. The numerical methods used to find the appropriate magnetic sector parameters for moderate pole face separations are described. An electron spectrometer constructed for a field-emmission-gun-equipped Philips EM400 is shown to have an energy resolution of 0.5 eV at a sector half acceptance angle of 1 mrad.

摘要

具有圆形边缘的均匀场磁扇形的聚焦方程被证明具有二阶双聚焦解。描述了用于找到中等极面间距的合适磁扇形参数的数值方法。为配备场发射枪的飞利浦EM400构建的电子光谱仪在扇形半接收角为1毫弧度时显示出0.5电子伏特的能量分辨率。