正电子湮没诱发俄歇电子能谱装置的物理设计  

Physical design of the positron induced Auger electron spectrometer

作　　者：秦秀波[1,2] 王平[1] 姜小盼[1,2] 于润升[1] 王宝义[1] 魏龙[1] 

机构地区：[1]中国科学院高能物理研究所核分析技术重点实验室,北京100049 [2]中国科学院研究生院,北京100049

出　　处：《核技术》2009年第4期264-268,共5页Nuclear Techniques

基　　金：国家自然科学基金(10835006;60606011;10705031)资助

摘　　要：与X射线、高能电子或中子激发俄歇电子能谱相比,正电子湮没诱发俄歇电子能谱(PAES)具有极表面选择性、高信噪比、低辐照损伤等特点。本文介绍北京慢正电子强束流的PAES装置,采用4×10-3T磁场对正电子和俄歇电子进行输运,强弱磁场梯度对俄歇电子进行平行化,法拉第筒对俄歇电子的能量进行调制,使得整个系统的能量分辨优于2eV。Positron Annihilation Induced Auger Electron Spectroscopy （PAES） has several advantages over those excited by X-rays, high energy electrons or neutrons, such as excellent surface selectivity, high signal-to-noise ratio, low radiation damage, etc. A physical design of time of flight PAES （TOF-PAES） apparatus based on the Beijing Intense Slow Positron Beam （BIPB） is described in this paper. The positrons and electrons are transported in a 4×10^-3 T uniform magnetic field, and the gradient of magnetic field is designed to parallelize the Auger electrons emitted with 2n angle. The Auger electron energy is adjusted by a Faraday cage to optimize the energy resolution, which can be better than 2eV.

关 键 词：俄歇电子能谱 正电子湮没 飞行时间 能量分辨 法拉第筒 

分 类 号：O671.23[理学—化学] O483