摘要
覆膜对浸渍扩散热阴极表面电子发射的影响一直是热阴极研究领域的重点课题。该文采用最新研制的深紫外激光光发射电子显微镜/热发射电子显微镜(DUV-PEEM/TEEM),对一半覆膜、另一半未覆膜的浸渍扩散阴极试样作了1150℃×2 h激活,并对其表面微区的热电子发射像及其随温度的变化作了比较。结果发现,两种阴极的热电子发射均主要位于孔隙及其邻近颗粒边缘;随温度升高,未覆膜阴极发射主要集中于孔隙内及周边有限区域内,发射面积增量较小,覆膜则使阴极有效发射区域得以由孔隙及其边缘向距孔隙更远的区域延伸,发射面积大幅增加。上述结果首次给出了覆膜浸渍扩散阴极微区的电子发射特征,对于理解该类型阴极发射机理有一定参考价值。
The impact on impregnated cathode electronic emission, when it is coated by films, is an important studied content in the field of thermionic cathode. A cathode sample is evenly split by impregnated dispenser cathode and coated impregnated dispenser cathode. The sample is activated at 1150℃ in the Deep UltraViolet laser Photo- and Thermal- Emission Electron Microscope system （DUV-PEEM/TEEM） for 2 hours. In this system, the micro- electron emission phenomenon of two cathode and its changes with temperature are compared and studied directly. The results show that the electronic emission of both impregnated cathode and coated impregnated cathode are mainly located at the pores and the edge of the adjacent particles; Along with the rise of cathode＇s temperature, the cathode emission without coating anything is still mainly focused on the pores and nearby narrow regions on cathode surface, that the emission area changed a little. However, for the coated impregnated dispenser cathode, the effective emission area is extended from the pores and its edge to the area far away from the pores. impregnated cathode coated mechanism of this cathode. These results for the first time with film. which have certain give the electron emission characteristics for reference value to understand the emission.
作者
阴生毅
任峰
卢志鹏
张永清
张申金
杨峰
卫东
邯娇
李阳
YIN Shengyi1, REN Feng1,2, LU Zhipeng1,2, ZHANG Yongqing1, ZHANG Shenjin3, YANG Feng3, WEI Dong4, HAN Jiao1, LI Yang1(1.Key Laboratory of High Power Microwave Sources and Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100039, China;3.Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;4.KYKY Technology Co Ltd, Beijing 100190, China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2018年第10期2535-2540,共6页
Journal of Electronics & Information Technology
基金
国家重大科学仪器设备开发专项(2012YQ120HD48)
关键词
覆膜浸渍扩散阴极
电子发射
微区
光发射电子显微镜
Impregnated dispenser cathode
Electron emission
Surface micro area
Photoemission electron microscope
