EXPERIMENTAL AND THEORETICAL RESEARCH OF ELECTRON EMISSION MECHANISM OF M-TYPE CATHODES  

作　　者：Yin Shengyi 

机构地区：[1]Key Laboratory of High Power Microwave Sources and Technologies,Institute of Electronics,Chinese Academy of Sciences

出　　处：《Journal of Electronics(China)》2014年第2期159-167,共9页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.60871053)

摘　　要：With the most advanced Synchronous Radiation Photoelectron Spectrum(SRPS),the emission mechanism of M-type cathodes has been investigated from the perspective of chemical state.Based on the experimental results of SRPS analysis,a new model of the electron emission mechanism for M-type cathode is discussed.The main topics in this paper include the research status of electron emission mechanism of M-type cathodes;the advantages of SRPS technology;the distribution of oxygen chemical state on the cathode surface and the evolvement of oxygen chemical state during activation process;the relation between barium chemical state and osmium(Os)-coating;surplus barium and its formula;the characteristics of Os,and other noble metal coatings;the relation between film characteristics and emission performance of cathodes,the inhibition effects to the emission for Platinum(Pt)-coated cathode,etc.At the end of this paper,electron emission mechanism of M-type cathode is summarized and foreseen.With the most advanced Synchronous Radiation Photoelectron Spectrum （SRPS）, the emission mechanism of M-type cathodes has been investigated from the perspective of chemical state. Based on the experimental results of SRPS analysis, a new model of the electron emission mechanism for M-type cathode is discussed. The main topics in this paper include the research status of electron emission mechanism of M-type cathodes; the advantages of SRPS technology; the distribution of oxygen chemical state on the cathode surface and the evolvement of oxygen chemical state during activation process; the relation between barium chemical state and osmium （Os）-coating; surplus barium and its formula; the characteristics of Os, and other noble metal coatings; the relation between film characteristics and emission performance of cathodes, the inhibition effects to the emission for Platinum （Pt）-coated cathode, etc. At the end of this paper, electron emission mechanism of M-type cathode is summarized and foreseen.

关 键 词：M-type cathodes Synchronous Radiation Photoelectron Spectrum(SRPS) Chemical state OXYGEN Surplus barium 

分 类 号：O462[理学—电子物理学]