Design of an efficient monochromatic electron source for inverse photoemission spectroscopy  

作　　者：耿东平 杨迎国 刘树虎 洪才浩 高兴宇 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences [2]Institute of High Energy Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2014年第11期115-120,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11175239);One Hundred Person Project of Chinese Academy of Sciences;Instrument design and development Project of CAS:Spin rosolved Inverse-PES system

摘　　要：A design for 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 the 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 27 μA. Pass energy （P.E.） of 10 eV and 5 eV are discussed, respectively.A design for 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 the 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 27 μA. Pass energy （P.E.） of 10 eV and 5 eV are discussed, respectively.

关 键 词：beam flux electrostatic lens hemispherical deflection monochromator fringing effect energy resolu-tion SIMION 

分 类 号：O582[理学—物理]