Influence of cesium on the stability of a GaAs photocathode  

作　　者：张俊举 常本康 付小倩 杜玉杰 李飙 邹继军 

机构地区：[1]School of Electronic Engineering & Optoelectronic Techniques,Nanjing University of Science and Technology

出　　处：《Chinese Physics B》2011年第8期470-474,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 60678043,60871012,and 60801036);the Research Funding of Nanjing University of Science and Technology (Grant No. 2010ZYTS032)

摘　　要：The stability of a reflection-mode GaAs photocathode has been investigated by monitoring the photocurrent and the spectral response at room temperature. We observe the photocurrent of the cathode decaying with time in the vacuum system under the action of Cs current, and find that the Cs atoms residing in the vacuum system are helpful in prolonging the life of the cathode. We examine the evolution and analyse the influence of the barrier on the spectral response of the cathode. Our results support the double dipolar mode] for the explanation of the negative electron affinity effect.The stability of a reflection-mode GaAs photocathode has been investigated by monitoring the photocurrent and the spectral response at room temperature. We observe the photocurrent of the cathode decaying with time in the vacuum system under the action of Cs current, and find that the Cs atoms residing in the vacuum system are helpful in prolonging the life of the cathode. We examine the evolution and analyse the influence of the barrier on the spectral response of the cathode. Our results support the double dipolar mode] for the explanation of the negative electron affinity effect.

关 键 词：GaAs photocathode negative electron affinity ACTIVATION photocathode stability 

分 类 号：TN383.4[电子电信—物理电子学]