Surface Chemistry Studies with Ion Beams and Lasers

摘要CHE-0555314温诺格勒/宾夕法尼亚州这项研究项目由分析和表面化学计划支持，研究高能粒子与固体之间相互作用的基本方面，以期在各种表面化学研究中开发新的应用。在这些研究中，宾夕法尼亚州立大学的首席研究员和他的团队试图对团簇光束的特殊性质进行建模和开发(与原子初级粒子相比，离子束蚀刻过程中对更高分子的敏感性增强，化学损伤的累积减少)。具体地说，他们计划使用C60+初级投射体进行分子深度剖析实验，从而扩展之前的2维亚微米分辨率成像，为具有复杂分子结构的材料提供3-D分析。Winograd教授和他的同事的工作的潜在应用包括有机半导体和层状聚合物的分析。基本的见解将通过实验测量和分子力学建模的相互作用来得出。将测试模型的能力，以预测参数优化、离子发射能量和角度的实验轮廓以及使用沉积在金属衬底上的多肽掺杂海藻糖玻璃或无定形冰薄膜进行深度剖析时的侵蚀。这些研究的结果将影响到不同的领域，如质谱学、聚合物科学、天体物理学、药物发现、地质学和化学成像。这项工作将为一大群不同的、互动的研究生、博士后和来访的科学家提供独特的学习体验。

ABSTRACT CHE-0555314 Winograd/Pennsylvania State This research project supported by the Analytical and Surface Chemistry Program, addresses fundamental aspects of interactions between energetic particles and solids, with a view toward the development of novel applications in a variety of surface chemistry studies. In these studies, the Principal Investigator and his group at the Pennsylvania State University seek to model and exploit the special properties of cluster beams (enhanced sensitivity to higher molecular weight molecules and reduced accumulation of chemical damage during ion beam etching, compared with atomic primary particles). Specifically, they plan to use C60+ primary projectiles for molecular depth profiling experiments, thereby extending previous 2-dimensional sub-micron resolution imaging to provide 3-D analysis of materials with complex molecular architectures. Potential applications of the work of Professor Winograd and his coworkers include analysis of organic semiconductors and laminar polymers. Fundamental insights are to be derived through the interplay of experimental measurements and molecular mechanics modeling. Models will be tested for their ability to predict parameter optimization, experimental profiles of ion emission energies and angles, and erosion during depth profiling using thin films of peptide-doped trehalose glass or amorphous ice deposited on a metallic substrate. Results from these studies will impact such diverse fields as mass spectrometry, polymer science, astrophysics, drug discovery, geology, and chemical imaging. The work will provide a unique learning experience for a large, diverse, and interacting group of graduate students, postdocs, and visiting scientists.