电子诱导脱附研究钨表面O2对N2的置换吸附

实验测量了室温高真空条件下,多晶W表面O2和N2的电子诱导脱附（ESD）阈值能量.O2-W吸附对的ESD能量约为15.5 eV, N2-W吸附对的ESD能量约为13.8 eV.实验结果具有良好的可重复性.利用ESD阈值能量研究了多晶W表面O2对N2的置换吸附过程,表明在一定的时间间隔内,O2可以置换吸附在多晶W表面的N2,且该过程不可逆.对实验结果进行了分析.     

Dynamical Model in Low-Frequency-Pulsed Electron-Stimulated Desorption

A dynamical model of low-frequency-pulsed electron-stimulated desorption is developed. The characteristic of desorbed gas flow is taken as an exponential function, and can be degenerated to a triangular and square wave.The transient pressure is given according to the gas flow of desorbing gas and vacuum system parameters,including the pumping speed and the system volume. Although the mathematical model is deduced from the electron-stimulated desorption, it can be applied to other similar processes of intermittent desorption.     

低能脉冲电子探束研究“气-固”界面

介绍了利用低能脉冲电子探束研究“气-固”界面的基本原理和方法，并实验研究了室温T=300K、1×10^-3Pa真空条件下， O₂，N₂-Ni，W“气-固”界面的相互作用，即吸附、脱附与置换作用，测量了电子诱导脱附产额、脱附截面和阈值能量，给出了实验结果分析与结论. 关键词： 脉冲电子探束 电子诱导脱附 阈值能量 脱附截面