A Universal Formula for the Secondary Electron Yield of Metals at an Incident Angle of θ  

作　　者：XIE Ai-Gen ZHANG Jian WANG Tie-Bang 谢爱根;张健;王铁邦(College of Math and Physics,Nanjing University of Information Science and Technology,Nanjing 210044)

机构地区：[1]College of Math and Physics,Nanjing University of Information Science and Technology,Nanjing 210044

出　　处：《Chinese Physics Letters》2011年第9期253-256,共4页中国物理快报（英文版）

基　　金：by Scientific Research Fund of Nanjing University of Information Science and Technology(No S8108197001);the Natural Science Foundation of Jiangsu Provincial Universities(No 10KJB180004).

摘　　要：Based on the main physical processes,we deduce the relationships among the incident energy Wp0 of the primary electron,the number of released secondary electrons(i.e.δ_(PEθ))per primary electron entering the metal at incident angleθand the angleθitself.In addition,the relationship ofδPEθatθ=0°,i.e.δ_(PE0),with Wp0 is determined.From the experimental results,the relationship of the ratio atθ=0°,i.e.β_(0) which is the ratio of the average number of released secondary electrons generated by a single primary electron backscattered at the metal surface to that generated by a single primary electron entering the metal,with Wp0 is determined.Moreover,the relationships among the ratioβθ,Wp0 andθare obtained.Based on the relationships among the secondary electron yield atθ(i.e.δθ),the yield atθ=0°(i.e.δ_(0)),the backscattering coefficient atθ(i.e.η_(θ)),the coefficient atθ=0°(i.e.η0),δ_(PEθ)andδ_(PE0),we deduce the universal formula forδ_(θ),δ_(0),η_(θ),η_(0),and W_(p0) for the primary electrons at an incident energy of 2–10 keV.The secondary electron yields calculated from the universal formula and the experimental yields of some metals are compared,and the results suggest that the proposed formula is universal for estimation of secondary electron yields atθ=0°−80°.

关 键 词：INCIDENT deduce COEFFICIENT 

分 类 号：O46[理学—电子物理学]