Study on Surface of Impregnated Cathodes Coated Os Film by Synchronous Radiation Photoelectron Spectrum
Yin Sheng-yi① Zhang Hong-lai① Yang Jing-xin①② Urash Ibrahim③ Qian Hai-jie③ Wang Jia-ou③ Wang Yu① Wang Xin-xin①
①(Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(Graduate University of Chinese Academy of Sciences, Beijing 100039, China) ③(Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China)
Abstract：Why a layer of Os film with high work function can increase the emission ability of impregnated cathode notably? This is an undecided important problem for a long time. In this article, based on the emission test and scanning electron microscope analyzing, the Synchronous Radiation PhotoelEctron Spectrum (SRPES) technology is used to measure element composition and chemical states on W-film cathodes and Os-film cathodes. The results indicate, the emission ability of the cathode coated with Os-film is higher than that coated with W-film by 1.65 times, and Os-film can increase the number of barium atom and low binding energy oxygen atom on the surface of cathodes by 40% and 56% comparing to W-film. With further analysis, the low melting point and characteristics apt to resolve for the oxides of Os film, accelerate the transformation of oxygen on cathode surface during activation, thus cause the Os-film cathode surface to get more surplus barium Ba+(a) and to get higher emission ability.
阴生毅, 张洪来, 杨靖鑫, 奎热西, 钱海杰, 王嘉欧, 王宇, 王欣欣. 覆锇膜阴极表面同步辐射光电子谱研究[J]. 电子与信息学报, 2011, 33(12): 3040-3045.
Yin Sheng-Yi, Zhang Hong-Lai, Yang Jing-Xin, Kui Re-Xi, Qian Hai-Jie, Wang Jia-Ou, Wang Yu, Wang Xin-Xin. Study on Surface of Impregnated Cathodes Coated Os Film by Synchronous Radiation Photoelectron Spectrum. , 2011, 33(12): 3040-3045.
2011, Vol. 33 
