Ion/Surface and Ion/Molecule Collisions in Mass Spectrometry

质谱中的离子/表面和离子/分子碰撞

• 批准号: 9223791
• 负责人: Robert Cooks
• 金额: $ 103.74万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9223791&HistoricalAwards=false
• 关键词: Ion; Surface; Molecule; Collisions; Mass

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.

该研究项目得到了分析和表面化学项目的支持，旨在了解当数十eV能量的分子离子撞击表面时发生的过程。碰撞时发生表面诱导解离（SID）和离子/表面反应。这项工作的总体目标是发展对离子/表面碰撞作为分析质谱中的结构分析工具所需要的理解。自组装的单层表面，以及分子吸附在表征的金和银底物将被研究作为这些SID应用的有用表面。要探索的离子/表面碰撞现象的范围将包括电离吸附剂的低能溅射，双带电离子的部分中和，以及分子束与表面的碰撞。离子碰撞法的使用为被分析物引入了大量的内能，便于质谱法对大分子的结构进行表征。引入这种内能的一个非常有前途的方法是离子/表面碰撞过程。离子/表面碰撞导致表面诱导解离和与表面的反应，可用于获得有关分子的结构信息。本研究项目涉及基本的离子/表面相互作用化学，它构成了这种分析方法的基础。