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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.

对多电荷离子和低能电子与稀有气体固体表面的相互作用进行了实验研究。取得了以下成果：·本文测量了低能电子轰击固体Ne表面脱附亚稳原子的飞行时间谱。通过在7.0K温度下对样品表面进行退火处理，使脱附原子的动能增加，并且使角分布的尖锐度向样品表面的法线方向增加。这些结果已通过考虑退火导致的样品表面结晶来解释。·测量了多电荷离子碰撞从固体Ne表面脱附的团簇离子。令人惊讶的是，观察到的大团簇的大小达到了100。·用Ar^<q+>（q= 1.6）和Ne^<q+>（<q= 1.5）原子轰击固体Ne表面，测量了绝对脱附产额。我们已经成功地分离的贡献'电势溅射'和'动力学溅射'通过测量的解吸率对入射离子能量的依赖性。目前的结果表明，“动力学溅射”的产量为2.5原子每1电子伏特的入射能量，和“电位溅射”是3.8原子每1电子伏特的内部能量。我们还表明，固体Ne的“电势溅射”的阈值能量约为20 eV，这对应于固体Ne的激子产生能量和带隙能量。