關(guān)于鋇系統(tǒng)熱陰極的電子發(fā)射機(jī)理
ON THE EMISSION MECHANISM OF BARIUM CONTAINING THERMIONIC CATHODES
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摘要: 通過對文獻(xiàn)中提出的有關(guān)鋇系統(tǒng)熱陰極的數(shù)據(jù),特別是用近代表面分析儀器所獲得的數(shù)據(jù)的綜合和分析,我們得到一個(gè)統(tǒng)一的理論,即動(dòng)態(tài)表面發(fā)射中心模型。在氧化物陰極中,鋇吸附在堿土金屬氧化物上;在鋇鎢陰極中,鋇吸附在鋁酸鹽或鎢酸鹽等上都可以形成發(fā)射中心。發(fā)射中心應(yīng)該大到足以屏蔽基金屬所產(chǎn)生的勢場,但又應(yīng)小到有利于電子從基金屬到中心的傳遞,最后對表面發(fā)射中心的組成和動(dòng)態(tài)性質(zhì)也進(jìn)行了討論。
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關(guān)鍵詞:
Abstract: Through the analysis and synthesis of data obtained from barium containing thermionic cathodes, especially those by modern surface analysis technique, we have come to a unified theory-the dynamical surface emission center model. Barium adsorbed on the surface of alkaline earth metal oxides in case of oxide cathode or of aluminate, tungstate etc. in case of dispenser cathode may form the emission center. Its size should be large enough to screen off the attractive field produced by the substrate, but small enough to facilitate the transport of electrons from the substrate to the emitting center. The compositions and the dynamical characters of the surface emission center are also discussed. -
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