Experimental study on the interaction of multiply-charged ions with rare gas solid surfaces

多电荷离子与稀有气体固体表面相互作用的实验研究

基本信息

批准号：
14340125
负责人：
HIRAYAMA Takato
金额：
$ 9.28万
依托单位：
Rikkyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340125/
关键词：
Rare Gas Solid DIET Multiply-charged ions Kinetic Sputtering Potential Sputtering Cluster Exciton Van der Waals固体角度分布同時計測

项目摘要

Experimental study has been done on the interaction of multiply-charged ions and low-energy electrons with rare gas solid surfaces. Following results have been obtained.・Time-of-Flight spectra have been measured for the desorbed metastable atoms from the surface of solid Ne by low energy electron impact. By annealing the sample surface at the temperature of 7.0K, the kinetic energy of desorbed atoms was increased, and the sharpness of the angular distribution was also increased toward the normal direction of the sample surface. These results have been explained by considering the crystallization of the sample surface by annealing.・Cluster ions desorbed from the surface of solid Ne by multiply charged ion impact have been measured. Surprisingly large clusters the size of which reached to 100 was observed.・Absolute desorption yields have been measured from the surface of solid Ne by Ar^<q+>(q=1〜6) and Ne^<q+>(<q=1〜5) impact. We have succeeded in separating the contribution of 'Potential Sputtering' and 'Kinetic Sputtering' by measuring the dependence of the desorption yield on the incident ion energy. The present results show that 'Kinetic Sputtering' yield was 2.5 atoms per 1 eV incident energy, and 'Potential sputtering' was 3.8 atoms per 1 eV internal energy. We have also shown that the threshold energy for the 'Potential Sputtering' for solid Ne was about 20 eV, which corresponds to the exciton creation energy and band gap energy of solid Ne.

实验研究已经完成了多电荷离子和低能电子与稀有气体固体表面的相互作用。已经获得了以下结果。・通过低能电子撞击，已经测量了从固体NE表面的亚稳定原子的飞行时间光谱。通过在7.0k的温度下退火样品表面，提高了解吸原子的动能，并且角度分布的清晰度也朝向样品表面的正常方向增加。通过退火来考虑样品表面的结晶来解释这些结果。已经测量了从固体表面通过乘电荷离子撞击从固体NE表面解吸的簇离子。令人惊讶的是，观察到达到100的大小的大簇被观察到。・绝对吸收率已经通过ar^<q+>（q = 1至6）和ne^<q+>（<q = 1至5）的影响从固体NE的表面进行了测量。我们成功地通过测量解吸产量对入射离子能的依赖性来分离“潜在的溅射”和“动力溅射”的贡献。目前的结果表明，“动力学溅射”产率为每1 eV入射能量为2.5个原子，“潜在溅射”为每1 eV内部能量3.8原子。我们还表明，固体NE的“电位溅射”的阈值能量约为20 eV，这对应于固体NE的兴奋产生能量和带隙能。