Raman - Ionization Studies of Molecular Clusters

9313344尼布勒在化学系物理化学计划的这个项目中，俄勒冈州立大学的J·W·尼布勒教授将对尺寸从1到100纳米的纳米团簇的形成、生长和表面/整体性质进行研究。这些星团将在超音速膨胀中产生，并确定它们的相、热力学温度和其他性质。实验技术将依赖于非线性拉曼光谱，特别是相干反斯托克斯拉曼光谱(CARS)和受激拉曼光谱(SRS)以及双共振法。氮气、二氧化碳和氢气分子簇将是研究的主要物种。大星系团的研究目前在化学、物理和材料科学中得到了广泛的应用，其基本性质还有待于更充分的探索。由没有永久偶极矩的单体分子组成的团簇不能完全用红外光谱来研究。在这种情况下，拉曼光谱方法能够提供所需的信息。这项研究将提供有关团簇的结构、物相、相变和表面效应的信息。这些信息将对发展星系团结构和动力学的理论模型很重要。***

9313344 Nibler In this project of the Physical Chemistry Program in the Chemistry Division, Prof. J.W. Nibler of Oregon State University will undertake an investigation of the formation, growth, and surface/bulk properties of nanoclusters ranging in size from 1 to 100 nanometers. These clusters will be produced in a supersonic expansion and their phases, and thermodynamic temperatures, and other properties determined. The experimental technique will rely on non-linear Raman spectroscopies, specifically the methods of Coherent Anti-Stokes Raman Spectroscopy (CARS) and Stimulated Raman Spectroscopy (SRS) as well as double resonance methods. Clusters of nitrogen, carbon dioxide, and hydrogen molecules will be the principal species investigated. %%% The study of large clusters is now wide spread in chemistry, physics, and materials science and their fundamental properties remain to be more fully explored. Clusters composed of monomer molecules having no permanent dipole moment are not fully accessible to study by means of infrared spectroscopy. In such cases the Raman spectroscopic method is capable of providing the desired information. This research will provide information on the structures, phases, phase transitions, and surface effects of clusters. This information will be of importance for the development of theoretical models of cluster structure and dynamics. ***