Reactive Collisions of State-Selected Molecular Ions with Surfaces

状态选择分子离子与表面的反应碰撞

• 批准号: 9615878
• 负责人: Dennis Jacobs
• 金额: $ 33.9万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615878&HistoricalAwards=false
• 关键词: Reactive; Collisions; State; Selected; Molecular

State to state dynamics of the interaction of small molecular ions with well characterized solid surfaces is the subject of this research project. Professor Jacobs' work at the University of Notre Dame, supported by the Analytical and Surface Chemistry Program, uses state specific methods to prepare a beam of ions in a particular quantum state. This ion is then scattered from a solid surface prepared and characterized in ultra high vacuum, and the scattered ion identity, velocity, and energetics are determined. The results of these detailed measurements are compared with wave packet calculations to enable the interpretation of the scattering process. The specific systems investigated include N2+ and CO+ scattering from Pt(111), HBr+ scattering from Si(100), and C2H2+ interacting with various metallic surfaces. The results of this work provide important basic information for the mechanisms of ion etching and surface induced dissociation of organic ions for mass spectrometric characterization. A detailed mechanistic understanding of ion surface interactions is vital to several technologically important fields, such as reactive ion etching of semiconductors, satellite dynamics in low earth orbit, and surface induced dissociation mass spectrometry. The work of this project is designed to provide this detailed mechanistic understanding, using the sophisticated methods of state preparation and surface scattering.

态到态动力学的相互作用的小分子离子与良好的表征固体表面是本研究项目的主题。 雅各布斯教授在圣母大学的工作，由分析和表面化学计划的支持，使用状态特定的方法来准备一束离子在一个特定的量子状态。 然后，该离子从在超高真空中制备和表征的固体表面散射，并且确定散射的离子身份、速度和能量。 这些详细的测量结果进行了比较与波包计算，使散射过程的解释。 研究的具体系统包括N2+和CO+从Pt（111）散射，HBr+从Si（100）散射，和C2H2+与各种金属表面相互作用。 本工作为离子刻蚀机理和有机离子表面诱导解离机理的质谱表征提供了重要的基础信息。 离子表面相互作用的详细机制的理解是至关重要的几个技术重要的领域，如半导体的反应离子蚀刻，在低地球轨道的卫星动力学，表面诱导解离质谱。 这个项目的工作是为了提供这种详细的机械理解，使用状态准备和表面散射的复杂方法。