Design of an efficient monochromatic electron source for inverse photoemission spectroscopy

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...

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Published inChinese physics C Vol. 38; no. 11; pp. 115 - 120
Main Author 耿东平 杨迎国 刘树虎 洪才浩 高兴宇
Format Journal Article
LanguageEnglish
Published 01.11.2014
Subjects
Deflection
Electrodes
Electron sources
Electrostatics
HDM
Inverse
Lenses
Monochromators
Photoelectron spectroscopy
光电子能谱
单色器
电子源
聚焦透镜
能量分辨率
设计
静电透镜
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Summary: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.
Bibliography:beam flux, electrostatic lens, hemispherical deflection monochromator, fringing effect, energy resolu-tion, SIMION
11-5641/O4
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.
GENG Dong-Ping, YANG Ying-Guo, LIU Shu-Hu, HONG Cai-Hao, GAO Xing-Yu（ 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China ; 2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China）
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/38/11/118202