Ion/Surface and Ion/Molecule Collisions in Mass Spectrometry

这个研究项目，支持在分析和表面 化学计划，解决了一个发展 了解分子离子 数十电子伏的能量冲击表面。 表面诱导 解离（SID）和离子/表面反应发生在 碰撞 这项工作的总体目标是开发 理解使用离子/表面碰撞作为 质谱分析中的结构分析工具。 自组装单层表面，以及分子 在可表征的金和银基底上的吸附物将 作为这些SID应用的有用表面进行研究。 待探索的离子/表面碰撞现象的范围 将包括离子化吸附物的低能溅射， 部分中和双电荷离子，分子 光束与表面的碰撞。 %%% 大分子的质量结构表征 通过使用离子碰撞方法， 其将显著的内能引入分析物中。 一个非常有前途的方法， 是离子与表面碰撞的过程。 离子/表面 碰撞导致表面诱导解离和反应 其表面可用于获得结构 有关分子的信息。 本研究 项目解决了基本的离子/表面相互作用 化学是这种分析方法的基础。

This research project, supported in the Analytical and Surface Chemistry Program, addresses the development of an understanding of the processes which occur when molecular ions of tens of eV energy impact upon surfaces. Surface induced dissociation (SID) and ion/surface reactions occur upon collision. The overall goal of this work is to develop the understanding which is needed to use ion/surface collisions as a structural analysis tool in analytical mass spectrometry. Self-assembled monolayer surfaces, as well as molecular adsorbates on characterizable gold and silver substrates will be investigated as useful surfaces for these SID applications. The range of ion/surface collision phenomena to be explored will include low energy sputtering of ionized adsorbates, partial neutralization of doubly charged ions, and molecular beam collisions with surfaces. %%% The structural characterization of large molecules by mass spectrometry is facilitated by the use of ion collision methods which introduce significant internal energy into the analyte. A very promising approach for introducing this internal energy is the process of ion/surface collision. Ion/surface collisions result in surface induced dissociation and reactions with the surface which can be used to obtain structural information about the molecules involved. This research project addresses the fundamental ion/surface interaction chemistry which forms the basis for this analytical approach.