金属表面结构的变角XPS特征

采用仅改变阳极高压以获得不同激发光子流强的变角Ｘ光激发电子能谱（ＸＰＳ），研究Ａｌ、Ｆｅ、Ｃｕ、Ｔａ及Ｗ中光电子峰的表面结构效应。实验结果表明，在面心立方的Ａｌ及体心立方的Ｔａ和Ｗ中均显示表面结构产生的衍射效应，而在Ｆｅ和Ｃｕ中未出现表面结构效应；所出现表面结构效应的差异与阳极高压及光子流的能量有紧密的关系。同时，在实验高压范围内存在一个产生表面结构效应的阳极电压阈值。文中就观察到的表面结构效应之差异的可能机制进行了初步探讨。

Effects of Metal Surface Structure on the Angular Anisotropy of XPS

The intensity distribution of photoelectrons as a function of X ray beam angle incidence was investigated Diffraction caused by surface structure anisotropy was observed in the following metal samples:Al with face centered cube,Ta and W with body centered cubes No effect was observed in Fe and Cu samples The effect is closely related to the anodic high voltage and X ray energy In experimental anode high voltages there is a range of threshold values in which the surface structure effects can be observed remarkably The possible mechanism of this effect was discussed