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 hemispherica...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.展开更多
基金Supported by National Natural Science Foundation of China(11175239)One Hundred Person Project of Chinese Academy of SciencesInstrument design and development Project of CAS:Spin rosolved Inverse-PES system
文摘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.
