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Dynamics of Phdto stimulated Desorption from Solid Surfaces

Phdto 刺激固体表面解吸的动力学

基本信息

批准号：
11640327
负责人：
TANAKA Shinichiro
金额：
$ 2.37万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640327/
关键词：
Dpsnrntion induced bv electronic excitation Synchrotron Radiation Cora-level excitation Solid surface Photoelectron suectrosconv Electron-ion coincidence snectroscopv SrTiO_3 光刺激脱離 ZnO Xe Si(111)(7x7)表面 TiO_2 H_2O コインシデンス分光

项目摘要

Photo-stimulated desorption from solid surfaces has been investigated by the main use of electron-ion coincidence spectroscopy combined with the synchrotron radiation. Results are as follows;1. The site-specific phenomena, where the excitation on different atoms (including the difference in the chemical environment) caused different bond-breaking, was found. It suggested that the control of the photo-chemical reaction will be possible by using the soft-X-ray, 2. Photo-stimulated desorption induced 9by the metal-core excitation on transition and non-transition metal oxide surfaces has been investigated, and it was found that the conventional KF model was not sufficiently applicable. A new model of the charge transfer (Kotani-Toyozawa mechanism) was proposed for explaining the experimental results, 3. Photo-stimulated desorption induced by the Ols-excitation on the metal oxide surfaces and molecular-adsorbed semiconductor surfaces have been investigated. It was found that the ion desorption took place as a result of the formation of the multiple-hole final state produced by the shake-up/off excitation accompanying the core-excitation and the Auger decay, and 4. Electron-ion coincidence spectroscopy was used for a analysis of the ice surface, and it was shown that this technique can be used as an extremely surface sensitive ESCA.Photoelectron spectroscopy was also used for investigating the decay dynamics of the core-excited state, and 5. It was found that the lifetime of the surface core exciton is longer than that of the bulk one on the Xe film. Moreover, 6. The instrumental system of the time-resolved two-photon photoelectron spectroscopy using the femto-second laser was constructed. The preliminary results are now obtained.

本文主要利用电子-离子符合光谱技术结合同步辐射研究了固体表面的光激励脱附。结果如下：1.发现了不同原子上的激发（包括化学环境的差异）导致不同键断裂的位点特异性现象，表明利用软X射线控制光化学反应是可能的。研究了过渡金属氧化物和非过渡金属氧化物表面金属核激发引起的光刺激脱附现象，发现传统的KF模型并不完全适用。提出了一种新的电荷转移模型（Kotani-Toyozawa机制）来解释实验结果。本文研究了金属氧化物表面和半导体表面分子吸附态的光激发脱附现象。结果表明，离子脱附的发生是由于伴随着核心激发和俄歇衰变的shake-up/off激发所产生的多空穴终态的形成。利用电子-离子符合谱对冰表面进行了分析，结果表明，该技术可以作为一种非常灵敏的表面ESCA，光电子能谱也被用于研究冰核激发态的衰减动力学。结果表明，在薄膜中，表面芯激子的寿命比体激子的寿命长。此外，6.搭建了飞秒激光时间分辨双光子光电子能谱的仪器系统。初步结果现已得出。