关于钡系统热阴极的电子发射机理
ON THE EMISSION MECHANISM OF BARIUM CONTAINING THERMIONIC CATHODES
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摘要: 通过对文献中提出的有关钡系统热阴极的数据,特别是用近代表面分析仪器所获得的数据的综合和分析,我们得到一个统一的理论,即动态表面发射中心模型。在氧化物阴极中,钡吸附在碱土金属氧化物上;在钡钨阴极中,钡吸附在铝酸盐或钨酸盐等上都可以形成发射中心。发射中心应该大到足以屏蔽基金属所产生的势场,但又应小到有利于电子从基金属到中心的传递,最后对表面发射中心的组成和动态性质也进行了讨论。
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关键词:
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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