Title :
Study on chemical state of oxygen on surface of cathodes coated with Os or W film
Author :
Yin, Shengyi ; Yang, Jingxin ; Zhang, Honglai
Author_Institution :
Key Labouratory of High Power Microwave Sources & Technol., Chinese Acad. of Sci., Beijing, China
Abstract :
Why M-type cathode has higher emission performance? This is an undecided important problem for over 20 years. In this article, SRPES is used to study the chemical state of O on the surface of cathodes coated with Os or W film. It can be found that Ba/O and the content of low binding energy O species on the cathode surface coated with Os film are higher than that on W coated film remarkably. It is put forward that the surplus Ba atom is decided by the low binding energy O species. The view can be used to interpret the problem partly mentioned at the beginning.
Keywords :
cathodes; osmium; oxygen; tungsten; M-type cathode; Os film; SRPES; W film; cathode surface; cathodes; chemical state; low binding energy O species; oxygen; Barium; Cathodes; Chemicals; Electron emission; Films; Surface treatment; Tungsten; M-type cathode; Oxygen; Synchronous radiation photoelectron spectrum; chemical state;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2011 IEEE International
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-8662-5
DOI :
10.1109/IVEC.2011.5747035
