Assembly and spectroscopic interrogation of large atomic and molecular clusters in helium droplets

氦液滴中大原子和分子簇的组装和光谱询问

• 批准号: 1112391
• 负责人: Andrey Vilesov
• 金额: $ 50.78万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1112391&HistoricalAwards=false
• 关键词: Assembly; spectroscopic; interrogation; large; atomic

Through this award, funded by the Chemical Structure, Dynamics, and Mechanisms Program of the Division of Chemistry, Prof. Andrey Vilesov from the University of Southern California, along with his graduate student researchers, will study the assembly of atoms and molecules into clusters at the ultralow temperatures achievable in superfluid droplets of helium. These studies will focus on such species as metal atoms and hydrocarbon molecules, among others. The experiments will be carried out in the droplets themselves by employing laser methods in conjunction with mass spectroscopy. Many of the assembled clusters will also be imaged by way of electron microscopy. The clusters to be studied will range in size from just a few atoms/molecules to tens of millions and vary in composition from single-species clusters to mixed, core-shell metal-molecule clusters. The goal of these studies is to investigate the mechanisms of low temperature aggregation and to elucidate the structure and excitations in such clusters with size. The large helium droplets that Prof. Vilesov proposes to use may be useful vehicles for making new and interesting materials. The assembly and study of nanometer-sized clusters in droplets of helium will not only extend the variety of the nanomaterials available to researchers today but will also contribute toward the establishment of novel physical methods of low temperature fabrication. Students working with Prof. Vilesov have and will continue to receive extensive training in such cutting-edge technologies including, but not limited to, fast electronics, high vacuum methods, laser methods, and high resolution microscopy. Prof. Vilesov has a strong history of international collaboration and this will likely continue through this work.

通过这个奖项，由化学系的化学结构，动力学和机制计划资助，来自南加州大学的Andrey Vilesov教授，沿着与他的研究生研究人员一起，将研究原子和分子在超低温下组装成团簇，在氦的超流体液滴中实现。 这些研究将侧重于金属原子和碳氢化合物分子等物质。实验将在液滴本身中进行，采用激光方法结合质谱法。 许多组装的团簇也将通过电子显微镜成像。 要研究的簇的大小范围从几个原子/分子到数千万个，组成从单一物种簇到混合的核壳金属分子簇。 这些研究的目的是探讨低温聚集的机制，并阐明这种团簇的结构和激发与尺寸。 Vilesov教授建议使用的大氦滴可能是制造新的有趣材料的有用工具。氦液滴中纳米尺寸团簇的组装和研究不仅将扩展当今研究人员可用的纳米材料的种类，而且还将有助于建立低温制造的新物理方法。 与Vilesov教授合作的学生已经并将继续接受这些尖端技术的广泛培训，包括但不限于快速电子学，高真空方法，激光方法和高分辨率显微镜。 Vilesov教授有很强的国际合作历史，这可能会通过这项工作继续下去。