一种用于逆光电子能谱的高效单色电子源
An Efficient monochromatic Electron Source designed for Inverse Photoemission Spectroscopy
摘要：
介绍了一种用于逆光电子能谱仪的高效单色电子源的设计。电子源由BaO阴极、聚焦静电透镜、半球偏转单色器和转移静电透镜组成。HDM采用“缝入缝出”结构，通过两个半球之间的电极来校正一阶聚焦的退化，并采用解析方法和SIMION程序进行了电子射线追迹模拟。通过聚焦透镜、HDM和标准五元件转移透镜，估计最佳能量分辨率约为53 meV，束流通量为27 uA。传递能量（P.E.）分别讨论了10 eV和5 eV。
英文摘要：
A design of an efficient monochromatic electron source for Inverse Photoemission Spectroscopy (IPES) apparatus is described. The electron source consists of a BaO cathode, a focus electrostatic lens, a hemispherical deflection monochromator (HDM), and a transfer electrostatic lens. The HDM adopts a "slit-in and slit-out" structure and the degradation of first-order focusing is corrected by two electrodes between the two hemispheres, which has been investigated by both analytical methods and electron-ray tracing simulations using SIMION program. Through the focus lens, the HDM, and the standard five-element transfer lens, an optimal energy resolution is estimated to be about 53 meV with a beam flux of 27uA. Pass energy (P.E.) of 10 eV and 5 eV are discussed, respectively.
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