权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Research into the mechanism of the desorption induced by electronic transitions (DIET) at the surface of rare gas solids

稀有气体固体表面电子跃迁(DIET)诱导解吸机理研究

基本信息

批准号：
07455027
负责人：
ARAKAWA Ichiro
金额：
$ 3.46万
依托单位：
Gakushuin University, Faculty of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455027/
关键词：
rare gas solid exciton ionization in solid desorption DIET ESD PSD

项目摘要

We have investigated the desorption at the surface of rare ges solids innduced by electron and photon irradiation on it. The results achieved in this research project are summarized below.1. We have ascertained the validity of the cavity-ejection mechanism, which has been proposed for the desorption of metastables initiated by a surface exciton, by the detailed measurement of the kinetic energy distribution and the angular distribution of desorbed species. The absolute yield of desorption was also determined. This is regarded as a first step to give a quantitative picture of the desorption process.2. We have revealed that the desorption and the deexcitation process after the excitation of 2p^53p-type surface exciton, which is allowed only at surface, has a complex aspect in connection with its fine structure.3. In the experimental study on the alloy of rare gas solids, we have found a characteristic feature, selectivity of desorbed species for example, which was likely related to the excitation energy exchange between hetero-species and the diffusion of an exciton in alloyed matrix.4. We have revealed that a small amount of hydrogen physisorbed on the surface of rare gas solids causes a significant effect on the desorption process.5. Through the measurement of the excitation spectrum, the luminescence, and the kinetic energy of desorbed species with a high resolution apparatus, we got the clue which may reveal the detail of the elementary process, such as, the cascade of deexcitation, the diffusion process, so on.

我们研究了稀有Ge固体在电子和光子辐照下的表面脱附。本研究项目取得的成果总结如下：1.通过对脱附组份的动能分布和角分布的详细测量，证实了所提出的表面激子引发亚稳态脱附的空穴喷射机制的有效性。还测定了解吸的绝对产率。这被认为是对解吸过程进行定量描述的第一步。我们揭示了2p^53p型表面激子激发后的脱附和退激过程，这是只允许在表面进行的，与其精细结构有关。在对稀有气体固体合金的实验研究中，我们发现了一个特征，如脱附物种的选择性，这很可能与异种之间的激发能量交换和激子在合金基质中的扩散有关。我们发现少量的氢在稀有气体固体表面的物理吸附对脱附过程有显著的影响。通过用高分辨率的仪器测量解吸物种的激发光谱、发光和动能，我们得到了可能揭示基本过程细节的线索，如去激发级联、扩散过程等。