Reactive Collisions of State-Selected Molecular Ions with Surfaces

小分子离子与具有良好特性的固体表面相互作用的态到态动力学是本研究项目的主题。雅各布斯教授在分析和表面化学计划的支持下，在圣母大学的工作中，使用特定于状态的方法来制备处于特定量子态的离子束。然后这种离子从在超高真空中制备和表征的固体表面散射，并确定散射离子的一致性、速度和能量学。将这些详细测量的结果与波包计算进行比较，以便能够解释散射过程。所研究的特殊系统包括N_2~+和CO~+在铂(111)上的散射，HBr~+在Si(100)上的散射，以及C_2H_2~+与各种金属表面的相互作用。这项工作的结果为离子刻蚀和表面诱导有机离子解离的机理提供了重要的基础信息，用于质谱学表征。对离子表面相互作用的详细机理了解对于半导体反应离子刻蚀、近地轨道卫星动力学和表面诱导解离质谱学等几个重要技术领域至关重要。这个项目的工作旨在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。

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.