利用AES、XPS、UPS研究氧与钡钨阴极的互作用

应用科学学报 ›› 1988, Vol. 6 ›› Issue (1): 49-54.

利用AES、XPS、UPS研究氧与钡钨阴极的互作用

陈德森

南京工学院

收稿日期:1985-04-18 修回日期:1986-04-25 出版日期:1988-03-31 发布日期:1988-03-31

AES XPS AND UPS STUDIES OF THE INTERREACTION OF OXYGEN AND IMPREGNATED DISPENSER CATHODES

CHEN DESEN

Nanjing Institute of Technology

Received:1985-04-18 Revised:1986-04-25 Online:1988-03-31 Published:1988-03-31

摘要/Abstract

摘要： 本文叙述了用AES、XPS与UPS技术分析研究S型与M型钡钨阴极表面化学组态的差异.并用清洁钨上覆盖钡与氧化钡的模拟表面分析了钡、氧、钨三者的化学结构关系.与阴极的结果进行对比表明,M型阴极为Ba-O-W系统,S型阴极组态较复杂,可能有钡与氧化钡两种结构状态并存.氧会引起表面钡与基底钨化学态发生改变,导致阴极逸出功与发射改变.从谱图来看,S型阴极表面钡受氧的影响比M阴极的敏感得多;氧对钨的氧化作用强于对锇的作用.

Abstract: We have performed AES, XPS and UPS measurements of Type S and Type M tungsten dispenser cathodes as well as a model surface consisting of a barium monolayer on a tungsten strip in various stages of oxidation. The results indicate the presence of considerable difference between the Type S and Type M cathodes. It was found that Type M cathode is Ba-O-W system, while Type S cathode seems to be partial barium and partial barium oxide and oxygen coadsobed on tungsten. The oxygen may induce change of chemical state of surface barium and substrate tungsten, and change work function and emissive ability of cathodes. The barium layer in Type M cathode appears to be more insensitive to oxidation as indicated by core level changes tham that in the Type S cathode. The valence band structure is also less sensitive to oxygen than Type S cathode. The tungsten related features are more sensitive to oxygen compared to osmium.

陈德森. 利用AES、XPS、UPS研究氧与钡钨阴极的互作用[J]. 应用科学学报, 1988, 6(1): 49-54.

CHEN DESEN. AES XPS AND UPS STUDIES OF THE INTERREACTION OF OXYGEN AND IMPREGNATED DISPENSER CATHODES[J]. Journal of Applied Sciences, 1988, 6(1): 49-54.