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Manipulation of surface reaction using supersonic molecular beam

使用超声分子束操纵表面反应

基本信息

批准号：
12440156
负责人：
KUSUNOKI Isao
金额：
$ 9.54万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440156/
关键词：
surface reaction infrared spectroscopy supersonic molecular beam Nickel translational energy carbon monoxide hydrogen Xe

项目摘要

The reaction of gas molecules on solid surfaces is very important as it is related with catalysis and production of semiconductor devices. The objects of our research are the elucidation of the relation between the reactions on surfaces and the energy of molecules colliding the surface, and the manipulation of surface reactions with the control of the energy of molecules. We observed the effects of translational energy of gas molecules on the reactions of adsorbates.We used supersonic molecular beam apparatus to control the translational energy of gas molecules, Fourier transformed infrared spectrometer to detect the surface reaction, mass spectrometer to detect the desorbed molecules from the surface. The Ni(100) surface exposed to hydrogen gas and carbon monoxide gas is irradiated with energy controlled Xe atoms. When Xe energy is 0.5 eV, FTIR spectra of the CO/H/Ni(100) surface is not changed. However, when Xe energy is 1.0 eV, adsorption state of CO of the CO/H/Ni(100) changes and a part of CO molecules are desorbed from the surface. This phenomena is explained as the change of adsorption site of CO induced by Xe collision. We could control the desorption reaction which is the most elementary step in surface reactions by controlling the energy of molecules. We would like to develop the control of surface reaction by using energy controlled gas molecules, based on the present results.

气体分子在固体表面的反应是非常重要的，因为它关系到半导体器件的催化和生产。我们的研究对象是阐明表面反应与表面碰撞分子能量之间的关系，以及通过控制分子能量来操纵表面反应。我们观察了气体分子的平动能对吸附反应的影响。采用超音速分子束仪控制气体分子的平动能，傅里叶变换红外光谱仪检测表面反应，质谱仪检测表面解吸分子。Ni（100）表面暴露在氢气和一氧化碳气体中，用能量可控的Xe原子照射。当Xe能量为0.5 eV时，CO/H/Ni（100）表面的FTIR光谱没有变化。而当Xe能为1.0 eV时，CO/H/Ni（100）对CO的吸附状态发生变化，部分CO分子从表面解吸。这种现象可以解释为Xe碰撞引起CO吸附位置的改变。我们可以通过控制分子的能量来控制表面反应中最基本的一步——脱附反应。在现有研究成果的基础上，我们希望利用能量控制气体分子来控制表面反应。