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| 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) |
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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.
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Received: 14 April 2011
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Corresponding Authors:
Yin Sheng-yi
E-mail: syyin@mail.ie.ac.cn
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2011, Vol. 33 
