A Combined Energy and Angle Analyzer for Scattered Electrons

Abstract

An instrument is described which permits energy analysis, by electrostatic deflection, of any of six beams of scattered electrons. In the particular design discussed, the beams define scattering angles between 40 and 140°, in 20° intervals. Various parameters of electron trajectories, including effects of small magnetic fields, have been computed and design criteria for optimum angular and energy resolution are presented.