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A Study on Resonant Ionization Processes Relevant to Inner and Sub-Shell Electrons.

与内层和亚壳层电子相关的共振电离过程的研究。

基本信息

批准号：
63540289
负责人：
WAKIYA Kazuyoshi
金额：
$ 1.15万
依托单位：
Sophia University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

In the fiscal year 1988, we constructed a metal-beam oven based on a design of new idea, and installed it to an electron spectrometer on hand. We performed the following experiments with this newly constructed device. A study of post collision interaction has been carried out experimentally for Auger-electron emission of rare-gas atoms following electron-impact ionization. Spectra of the Xe, Kr, Ar, Auger electron have been measured changing the electron-impact energy from slightly above the threshold of the ionization to few kilo-electron-volts.The Auger line shape has been analyzed using a profile formula. Moreover, the analysis has partly considered the possible energy distribution of the scattered primary electron and the ejected secondary electron. The post-collision interaction effects is found to be absent at high excess energy.In the fiscal year 1989, we made some improvements on the device and carried on experiments on the partial cross sections for the inner-shell ionization.Partial ionization cross sections for the 4d-electrons in Xe, the 3dーelectrons in Kr,and the 2p-electrons in Ar have been measured by means of the Augerーelectron spectroscopy. The inner-shell ionization cross sections are deduced directly by the total Auger-electron emission cross sections, because the Auger yield is practically unity for the present case. The cross sections for the 4d-ionization in Xe are overwhelmingly greater than those for 3d-ionization in Kr and the 2p-ionization in Ar. The 4d-ionization cross section in Xe rises abruptly from 80eV and forms a first Maximum at 135eV, them it decreases once creating a distinct minimum and rises again giving a second maximum at around 500eV. The profile of the first maximum possesses the feature of the giant resonance while the second maximum appears to dominate the cross section.

在1988年的财政年度，我们建造了一个金属束炉的基础上设计的新的想法，并安装到电子光谱仪的手。我们用这种新构造的装置进行了以下实验。对稀有气体原子碰撞电离后俄歇电子发射的碰撞后相互作用进行了实验研究。在电子碰撞能量从略高于电离阈值到几千电子伏的变化过程中，测量了Kr、Ar、Oger电子的谱线，并利用轮廓公式分析了俄歇谱线的形状。此外，分析中还部分考虑了散射的初级电子和射出的次级电子的能量分布，发现在高过剩能量下，碰撞后相互作用效应不存在。我们对装置进行了改进，并进行了内壳层电离部分截面的实验，得到了4d-用俄歇电子能谱测量了Ar中的3d电子、Kr中的3d电子和Ar中的2 p电子。内壳层电离截面直接由总俄歇电子发射截面导出，因为俄歇产额在本例中实际上是1。氘的4d电离截面比氪的3d电离截面和氩的2 p电离截面大得多。4d电离截面从80 eV突然上升，并在135 eV处形成第一个最大值，然后下降，形成一个明显的最小值，并再次上升，在大约500 eV处形成第二个最大值。第一个极大值的截面具有巨共振的特征，而第二个极大值的截面占主导地位。