Magnetic properties of surface outermost layrs and adlayrs studied by a spin-polarized metastable-atom beam

自旋极化亚稳原子束研究表面最外层和阿层的磁特性

基本信息

批准号：
04452091
负责人：
NISHIGAKI Satoshi
金额：
$ 4.22万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

This project has animed at developing a beam source of helium metastable atoms polarized in electronic spin and at applying the source to the analysis of the spin state in surface outermost layrs. The research has progressed behind schedule because of a head-investigator's change of post. In the last year of the project term, we have performed an experiment of spin polarization of metastables as well as a study on the surface electronic using an established metastable deexciation spectroscopy (MDS) Apparatus.(1) We have constructed a source having an excitation chamber equipped with a hollow cathode and a skimmer together with an optical pumping unit for spin polarization. For the latter, circular-polarized photons have been created by passing He discharge light through a linear polarizer and a lambda/4 plate.(2) The electronic structure of Cs plus oxygen co-adsorbed layrs on the Ge (100) surface has been studied by MDS using a 2^3S He^* beam, mainly concerning Cs 6s, O 2p states and DELTA F.It is shown in the MDS spectra that the degree of electron transfer from adsorbed Cs 6s to incoming oxygen at the Ge (001) surface remains incomplete in contrast to a complete charge outflow from the Cs 6s orbitals to oxygen at the Si (001) surface. we have demonstrated by the whole experiment in this project that the MDS can extract very sensitively local density of states at surface outermost layrs.

该项目已经动画开发了在电子自旋中极化的氦亚稳定原子的光束源，并将源应用于表面最外层的旋转状态的分析。由于头部评估者的职位更改，这项研究已经进展了。在项目术语的最后一年中，我们使用已建立的亚稳态的去脱脱光学光谱（MDS）设备进行了一个对稳定物的自旋极化以及对表面电子的研究的实验。（1）我们构建了一个源，该源配备了一个具有空心阴极的激发室，并配备了空心阴极和撇渣器，并与光学泵送单位一起进行了旋转式极化。 For the latter, circular-polarized photons have been created by passing He discharge light through a linear polarizer and a lambda/4 plate.(2) The electronic structure of Cs plus oxygen co-adsorbed layrs on the Ge (100) surface has been studied by MDS using a 2^3S He^* beam, mainly concerning Cs 6s, O 2p states and DELTA F.It is shown in the MDS spectra that the degree of与从CS 6S轨道到SI（001）表面的氧气完全充电相比，电子从吸附的CS 6S转移到GE（001）表面的氧气（001）表面不完整。我们通过该项目的整个实验证明了MD可以提取表面最外层的状态的非常敏感的局部密度。