Abstract
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.
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Supported by the National Natural Science Foundation of China (No. 60871053).
Communication author: Yin Shengyi, born in 1964, male, Ph.D. Degree.
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Yin, S. Experimental and theoretical research of electron emission mechanism of M-type cathodes. J. Electron.(China) 31, 159–167 (2014). https://doi.org/10.1007/s11767-014-4044-3
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DOI: https://doi.org/10.1007/s11767-014-4044-3
Key words
- M-type cathodes
- Synchronous Radiation Photoelectron Spectrum (SRPS)
- Chemical state
- Oxygen
- Surplus barium