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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.

本文介绍了一种基于新原理的离子谱仪，并研究了该谱仪在电子受激脱附（ESD）实验中的应用。该谱仪被称为TOFFTIS（飞行时间傅里叶变换离子谱仪），具有极高的检测效率，实现了角分辨电子受激解吸离子谱。计算机模拟的结果表明，采用0.1米飞行管的TOFFTIS可以分析10 eV左右轻离子的能量分布。计算机模拟的结果表明，然而，一个TOFFTIS与亚1米飞行管不能作为质谱仪，因为质量分辨率差。因此，我们正在检查TOFFTIS的性能，仅作为ESD的离子能量分析仪。同时，利用高分辨电子能量损失谱（HREELS）记录固体表面吸附态的振动谱，研究了吸附态的取向和成键状态，并对吸附态的取向和成键状态进行了分析。并通过低能电子衍射（LEED）检查吸附物的有序结构。我们研究了（一氧化碳+氨），（一氧化碳+乙炔），（一氧化碳+甲胺）在钌（001）表面的共吸附系统。我们观察到的有序结构的形成后，共吸附，并发现一氧化碳在氨，乙炔，和甲胺的解离中起着关键作用。我们讨论了分子间相互作用的本质和通过添加共吸附物作为控制剂选择性激活化学键的可能性。