Surface Chemistry with Ion Beams and Lasers

离子束和激光的表面化学

• 批准号: 9115011
• 负责人: Nicholas Winograd
• 金额: $ 142.28万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1997-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115011&HistoricalAwards=false
• 关键词: Surface; Chemistry; Ion; Beams; Lasers

The project involves performing an extensive range of experiments designed to enhance the use of ion beams for the study of surface chemistry. These experiments are designed to (i) elucidate the fundamental aspects of ion/solid collisions, (ii) to characterize the chemistry and structure of solid surfaces using the basic information obtained in (i), and (iii) to optimize the application of ion beams in trace molecular analysis of surfaces and in submicron imaging. The use of multiphoton resonance ionization spectroscopy will enable neutral species to be ionized with both temporal and spatial resolution by using a movable mass spectrometer to measure the trajectories of the secondary ions produced. This will enable the measurement of neutrals, excited neutrals, and ions desorbed from well-defined surfaces subjected to ion bombardment. The experimental results will be compared with a theoretical model which uses molecular dynamics simulations. New experimental geometries will be determined by the use of shadow-cone enhanced desorption. New experiments in the trace molecular analysis of surfaces and in submicron atomic and molecular imaging will also be performed. %%% The research, in the general area of Analytical and Surface Chemistry, focuses on the use of energetic ion beams (of several thousand electron volts in energy) in surface chemistry research. These experiments promise to provide the most complete picture so far developed of ion/solid interactions, new approaches to the determination of surface chemical geometries, new methods for trace molecular analysis of surfaces, and new approaches to the atomic and molecular imaging of surfaces. The results from these studies should find widespread applications in such diverse fields as high molecular weight mass spectrometry, astrophysics, fusion reactor design, and ion implantation and etching of electronic materials.

该项目涉及执行广泛的 实验旨在提高离子束的使用， 表面化学的研究。 这些实验旨在 (i)阐明离子/固体碰撞的基本方面， (ii)来表征固体的化学和结构 使用（i）中获得的基本信息进行表面处理，以及 (iii)为了优化离子束在示踪中的应用， 表面的分子分析和亚微米成像。 多光子共振电离光谱的使用将 使中性物质能够被电离， 空间分辨率，通过使用可移动质谱仪， 测量产生的二次离子的轨迹。 这 将能够测量中性粒子，激发中性粒子， 离子从受到离子的良好限定的表面解吸 轰炸。 实验结果将与 一种使用分子动力学模拟的理论模型。 新的实验几何形状将通过使用 影锥增强解吸 新的痕迹实验 表面的分子分析和亚微米原子和 还将进行分子成像。 %%% 在分析和曲面的一般领域， 化学，侧重于使用高能离子束（ 几千电子伏特的能量）在表面化学中 research. 这些实验有望提供 迄今为止离子/固体相互作用的完整图像， 测定表面化学性质的新方法 几何形状，痕量分子分析的新方法， 表面，以及原子和分子的新方法 表面成像。 这些研究的结果应该 广泛应用于各种领域， 分子量质谱，天体物理，聚变 反应器设计、电子器件的离子注入和蚀刻 材料.