Study of Surface Adsorption Mechanism by Core-level Deexcitation Spectroscopy

芯级去激发光谱研究表面吸附机制

基本信息

批准号：
07640769
负责人：
EDAMOTO Kazuyuki
金额：
$ 1.34万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Adsorption of molecules on solid surefaces can be viewed as a elemental process of various surface reactions such as catalytic reactions, thus it is very important to elucidate the details of the microscopic mechanism of adsorption process. When a molecule adsorbs on a surface, the adsorption bonding orbital should be formed through the hybridization between the orbitals of the molecule and the surface, and it is essentially important to investigate the hybridization mechanism to elucidate the mechanism of adsorption process. Usually, the adsorption bonding levels are studied with photoemission spectroscopy, however, the adsorption level is inevitably overlapped with the bulk band emissions in the photoemission spectra and it is difficult to resolve adsorptioh bonding levels. The purpose of this work is to develop the method to observe the adsorption bonding levels selectively by the use of core-level deexciation spectroscopy.As the TiC (111) surface is exposed to oxygen, oxygen is adsorved dissociatively forming (1x1) overlayr. As the photoemission spectrum is measured under the conditiuon where Ti3p-3dexcitation occurs, it has been found that the O2p^Ti 3dadsorption level is resonantly enhanced to become main peak in the valence band spectra. Thus it is proved that adsorption bonding level can be selectively measured using core-level deexcitation spectroscopy. It is known that the alkali metal induced bonding level is difficult to observe due to the small cross section, . However it is proved that the bonding level can be selectively observed by the use obcore-level deexcitation spectroscopy.

可以将分子吸附在固体确定面上，这是各种表面反应（例如催化反应）的元素过程，因此阐明吸附过程的微观机制的细节非常重要。当分子吸附在表面上时，应通过分子和表面的轨道之间的杂交形成吸附键轨道，研究杂交机制以阐明吸附过程的机制非常重要。通常，通过光发射光谱研究了吸附键水平，但是，吸附水平不可避免地与光发射光谱中的整体带的发射重叠，并且很难解决adSorptioh键合水平。这项工作的目的是开发通过使用核心水平的除外光谱选择性地观察吸附键水平的方法。当TIC（111）表面暴露于氧气中时，氧气被赋予解离形成（1x1）覆盖物。由于光发射光谱是在发生Ti3p-3Dexcitation的孔子中测量的，因此发现O2P^Ti 3DADSSORPTION水平得到了共鸣，以增强，以成为价带光谱中的主要峰。因此，证明可以使用核心水平的表面光谱法选择性地测量吸附键水平。众所周知，由于较小的横截面，碱金属诱导的粘合水平很难观察到。然而，证明可以通过使用肥大级的去激光光谱来选择性地观察到键合水平。