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本文报道了Ｘ射线光电子能谱（ＸＰＳ）对新型热电子发射材料Ｍｏ－Ｌａ２Ｏ３（简称Ｍｏ－Ｌａ）阴极丝材高温状态下表面物质的分析过程。实验结果表明：随温度升高，Ｍｏ－Ｌａ阴极丝材表面Ｌａ２Ｏ３明显增多，半定量计算１３５０～１４５０℃时，表面Ｌａ２Ｏ３约为室温时的４倍；温度再升高，表面含量又减少，说明了Ｍｏ－Ｌａ阴极的激活和过激活过程，与实际装管试验结果相符。对不同温度下样品的Ｌａ３ｄ峰峰位和半高宽计算分析以及纯Ｌａ样品的谱峰分析结果显示，高温状态下Ｍｏ－Ｌａ阴极表面有可能分离出少的超额Ｌａ原子，对Ｍｏ－Ｌａ阴极发射机理研究具有直接指导意义。
In this paper, X-ray photoelectron spectroscopy (XPS) was used to analyze the surface material of the new hot-cathode material Mo-La2O3 (Mo-La) The experimental results show that with the increase of temperature, the La2O3 content on the surface of Mo-La cathode wire increases obviously. When the semi-quantitative calculation is from 1350 to 1450 ℃, the surface La2O3 is about 4 times of room temperature. When the temperature rises again, the surface content decreases again The activation and over-activation of the Mo-La cathode coincided with the actual tube loading test results. Calculation of peak position and FWHM of La3d peak at different temperatures and spectral analysis of pure La sample show that it is possible to separate small excess La atoms on the surface of Mo-La cathode under high temperature, Transmitting mechanism has direct guiding significance.