红外技术Issue(4)：202-206,5.
多碱阴极激活过程中逸出功及电子跃迁变化研究
Study on Variation of Work Function and Electron Transition of Multi Alkali Cathode during Cs Activation and Cs-Sb Activation
摘要
Abstract
In this paper, the spectral response and fluorescence spectrum of three Na2KSb multi-alkali cathodes without Cs activation, with Cs activation and with both Cs and Cs-Sb activation were measured. The measurement results show that, Na2KSb cathode after Cs activation, the cathode sensitivity was increased, long-wavelength cutoff wavelength was also extended, but the peak wavelength and peak intensity of fluorescence spectrum was essentially unchanged. The elongation of long-wavelength cutoff wavelength shows that work function of cathode is reduced, so the Na2KSb cathode after Cs activation, the increase of cathode sensitivity and elongation of long-wavelength cutoff wavelength is due to the lower work function. Na2KSb cathode after both Cs activation and Cs-Sb activation, the cathode sensitivity and long-wavelength cutoff wavelength were further increased, but the peak wavelength and peak intensity of fluorescence spectrum was changed. The peak wavelength was shifted towards the short wavelength and peak fluorescence intensity was increased. The shift of peak wavelength toward short direction showed that energy level of transition electron was increased and increasing of peak intensity of fluorescence spectrum showed that number of transition electron was increased. For Na2KSb cathode with Cs activation and Cs-Sb activation, the increase of transition electrons number and transition electron energy level has a positive effect on the cathode sensitivity. Therefore the reasons of increase for cathode sensitivity and long-wavelength cutoff wavelength of Na2KSb cathode by Cs activation and Cs-Sb activation are the increase in the number of transitions and transition electron energy levels except for the reason of reduced surface work function. Cathode surface electron escape mechanism is not yet conclusive, thus to improve the cathode sensitivity, further research is needed to figure out the objective law of cathode surface activation process. This will help to provide theoretical guidance to further improve cathode production process and to increase cathode sensitivity.关键词
多碱阴极/逸出功/光谱响应/荧光谱/电子跃迁Key words
multi alkali cathode/work function/spectral response/fluorescence spectrum/electron transition分类
数理科学引用本文复制引用
李晓峰,赵学峰,瞿利平,杨文波..多碱阴极激活过程中逸出功及电子跃迁变化研究[J].红外技术,2013,(4):202-206,5.基金项目
微光夜视技术重点实验室基金,编号:J2011016 （）
