Development of Time-of-Flight Fourier Transform Mass Spectrometer and its Application to a Novel Surface Analysis Technique

飞行时间傅里叶变换质谱仪的研制及其在新型表面分析技术中的应用

基本信息

批准号：
01840017
负责人：
IWASAWA Yasuhiro
金额：
$ 4.42万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

We have constructed an ion spectrometer based on a novel principle and studied on the application of this spectrometer to electron stimulated desorption (ESD) experiment. The spectrometer is called TOFFTIS (time-of-flight Fourier transform ion spectrometer) and has an extremely high detection efficiency, which realizes angle-resolved electron-stimulated-desorption ion spectroscopy. The results of computer simulation indicated that TOFFTIS with a 0.1-m flight tube can analyze energy distribution of light ions of about 10 eV. The results of computer simulation indicated, however, a TOFFTIS with sub-1-m flight tube cannot be used as a mass spectrometer because of bad mass resolution. We, therefore, are examining the performance of TOFFTIS only as a ion energy analyzer for ESD. It is expected that simultaneous measurement of both angular and energy distribution of ions desorbed from solid surfaces by electron impact allow the determination of orientation and bonding states of chemical species adsorbed on solid surfaces.We also carried out studies on orientation and bonding states of adsorbed species on solid surfaces by recording vibrational spectra of adsorbed species by high-resolution electron energy loss spectroscopy (HREELS) and by examining ordered structures of adsorbates by low-energy electron diffraction (LEED). We examined co-adsorption systems of (carbon monoxide+ammonia), (carbon monoxide+acetilene), and (carbon monoxide+methylamine) on the ruthenium (001) surface. We observed the formation of ordered structures upon co-adsorption and found that carbon monoxide plays a key role in the dissociation of ammonia, acetylene, and methylamine. We discussed the nature of intermolecular interaction and the possibility of the selective activation of chemical bonds by adding co-adsorbates as controling agents.

我们已经基于新原理构建了一个离子光谱仪，并研究了该光谱仪在电子刺激解吸（ESD）实验中的应用。光谱仪称为TOFFTIS（飞行时间傅立叶变换离子光谱仪），并且具有极高的检测效率，该效率实现了角度分辨的电子刺激性解析离子光谱。计算机仿真的结果表明，具有0.1米飞行管的TOFFTIS可以分析约10 eV的光离子的能量分布。但是，计算机仿真的结果表明，由于质量分辨率不佳，带有亚1M飞行管的TOFFTIS不能用作质谱仪。因此，我们仅作为ESD的离子能量分析仪检查TOFFTIS的性能。预计可以同时测量通过电子影响从固体表面解析的离子的角度和能量分布，从而确定化学物种的取向和粘结状态吸附在固体表面上的化学物种的方向和粘结状态。我们还通过记录固体表面上的固体表面上的振动范围（通过对固体型物种的均匀范围）（通过对固体表面的粘附型（通过高）进行振动型（通过高）进行固定型（通过均匀的型物种）进行研究（通过）较高的物种（通过低能电子衍射（LEED）检查吸附物的有序结构。我们检查了（一氧化碳+氨），（碳一氧化碳+乙烯烯）和（一氧化碳+甲胺）的共吸吸附系统（001）表面。我们观察到有序结构在共吸收后的形成，发现一氧化碳在氨，乙炔和甲胺的解离中起关键作用。我们讨论了分子间相互作用的性质以及通过添加共吸附物作为控制剂的化学键选择性激活化学键的可能性。