Surface Chemistry Studies with Ion Beams and Lasers

该研究项目由分析和表面化学计划支持，研究高能粒子和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发展新的应用。在这些研究中，首席研究员和他在宾夕法尼亚州立大学的团队试图模拟和利用簇束的特殊性质（与原子初级粒子相比，增强了对高分子量分子的敏感性，减少了离子束蚀蚀过程中化学损伤的积累）。具体来说，他们计划使用C60+初级弹丸进行分子深度剖面实验，从而扩展先前的二维亚微米分辨率成像，以提供具有复杂分子结构的材料的三维分析。Winograd教授及其同事工作的潜在应用包括有机半导体和层状聚合物的分析。基本的见解是通过实验测量和分子力学建模的相互作用得出的。模型将测试其预测参数优化的能力，离子发射能量和角度的实验剖面，以及使用沉积在金属衬底上的多肽掺杂海藻糖玻璃或非晶冰薄膜在深度剖面期间的侵蚀。这些研究的结果将影响质谱、聚合物科学、天体物理学、药物发现、地质学和化学成像等不同领域。这项工作将为一个庞大的、多样化的、互动的研究生、博士后和访问科学家群体提供一个独特的学习经验。

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.