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Surface Analysis by Using Inverse Photoelectron Spectroscopy

使用反光电子能谱进行表面分析

基本信息

批准号：
02650032
负责人：
KAMADA Masao
金额：
$ 0.19万
依托单位：
Okazaki National Research Institute (ONRI), Institute for Molecular Science (IMS)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650032/
关键词：
Soft-X-ray Inverse photoelectron spectroscopy Molecular Iuminescence electron-bombardment Sputtering

项目摘要

Photoelectron spectroscopy is a well-known method to see occupied electronic states in many substances. Recently, inverse photoelectroti spectroscopy attracts much interest, since we can investigate unoccupied electronic states by using it. however, there are lots of technical problems to apply the inverse photoelectron spectroscopy.We have aimed to construct inverse photoelectron spectrometer, especially in the soft-x-ray energy region and to investigate unoccupied electronic states of surfaces in metals, semiconductors, and insulators.On the way to our goal, however, we have found that surface electronic states change drastically in the experiment with inverse photoelectron spectroscopy. This change originates from the surface reaction induced by electron beam, which is an important device to conduct an experiment of inverse photoelectron spectroscopy. Thus, we have focused our power to investigate the surface reaction induced by electron beam.We have found that cyanide ions are produced in the surface layers of NaCi and KCI crystals by electron bombardment. The production mechanisms were discussed from experimental results of their temperature dependence. The sputtering of constituent atoms and ions was also observed, and its mechanisms were discussed. Moreover, the molecular luminescence Induced by electron beam was observed in high temperature superconductors and it was attributed to the surface cyanide ions.

光电子能谱是一种众所周知的观察许多物质中占据电子态的方法。最近，反向光电光谱引起了人们的极大兴趣，因为我们可以利用它来研究未占据的电子态。然而，逆光电子能谱的应用还有许多技术问题。我们的目标是建立逆光电子能谱仪，特别是在软X射线能区，并研究金属、半导体和绝缘体中表面的未占据电子态。然而，在实现目标的过程中，我们发现在逆光电子能谱实验中，表面电子态发生了巨大的变化。这种变化源于电子束引起的表面反应，电子束是进行反转光电子能谱实验的重要装置。因此，我们集中精力研究了电子束引起的表面反应。我们发现，氰离子是通过电子轰击在NaCI和KCI晶体的表层产生的。根据它们的温度依赖性实验结果，讨论了它们的产生机理。还观察到了组成原子和离子的溅射现象，并对其机理进行了讨论。此外，在高温超导体中观察到了电子束诱导的分子发光，并将其归因于表面的氰离子。