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Research into the relaxation mechanism of the exciton in rare gas solids by the study of desorption induced by electronic transitions (DIET)

通过电子跃迁诱导解吸研究（DIET）研究稀有气体固体中激子的弛豫机制

基本信息

批准号：
10450019
负责人：
ARAKAWA Ichiro
金额：
$ 8.38万
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：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450019/
关键词：
DIET ESD PSD exciton rare gas solid excited atom

项目摘要

We have investigated the dynamic aspect of excitons in rare gas solids by the experimental study of the desorption at the surface of rare gas solids induced by electron and photon irradiation.1. We have developed the new experimental systems :(1) system for the electron stimulated desorption study of solid Kr and Xe using a pulse tube refrigerator as a cryostat,(2) system for the desorption induced by electronic excitations study under extremely high vacuum condition,(3) laser plasma vacuum ultra violet source.2. The results achieved in this research project are summarized below.(1) Absolute yields of photo-induced desorption at the surface of solid Ne, Ar, and Kr have been measured. By bulk exciton excitation in a thick film, the desorption yield is 1, 0.2, and 0.01-0.1 atoms/photon for Ne, Ar, and Kr, respectively.(2) We have examined the difference between electron and photon excitations in the desorption processes.(3) We found that Ne excimers were desorbed via the cavity ejection mechanism and had the kinetic enegy of about 0.2 eV.The excimers desorbed were in the highest vibrational level since desorption takes place much faster than vibrational relaxation.(4) The model diagram of the relaxation cascade of excitons in bulk and at surface of solid Ne are proposed and some of the branching ratio in it have experimentally been determined.

我们通过对电子和光子辐照引起的稀有气体固体表面脱附的实验研究，研究了稀有气体固体中激子的动力学性质.我们研制了新的实验系统：（1）以脉冲管制冷机为低温恒温器的固体氪和氪的电子激发脱附研究系统;（2）极高真空条件下电子激发诱导脱附研究系统;（3）激光等离子体真空紫外光源.该研究项目取得的成果概述如下。(1)测量了固体Ne、Ar和Kr表面的光致脱附绝对产率。通过在厚膜中的体激子激发，对于Ne、Ar和Kr，解吸产率分别为1、0.2和0.01-0.1原子/光子。(2)我们已经研究了电子和光子之间的差异激发的解吸过程。(3)我们发现，Ne准分子通过腔喷射机制解吸，并具有约0.2 eV的动能。解吸的准分子是在最高的振动水平，因为解吸发生得比振动弛豫快得多。(4)本文提出了固体Ne的体激子和表面激子弛豫级联的模型图，并对其中的一些分支比进行了实验测定。