Spectroscopy and Dynamics of Quantum Clusters

量子团簇的光谱学和动力学

• 批准号: 0213149
• 负责人: Kenneth Janda
• 金额: $ 43.75万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-15 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0213149&HistoricalAwards=false
• 关键词: Spectroscopy; Dynamics; Quantum; Clusters

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Janda will study IVR processes in molecules and clusters embedded in liquid helium droplets at a temperature of 0.4 K. Appropriate pico-second pump-probe techniques and pulsed valve technology will be developed for both reactant preparation and monitoring the chemical dynamics inside the clusters.When gases are cooled to very low temperatures they usually condense into a liquid or solid form. When trapped into ultra-cold droplets of liquid helium, molecules and clusters largely retain their rotational and vibrational degrees of freedom. Their properties apparent at ordinary temperatures are only slightly modified owing to the weak interaction that couples them to the surrounding bath of liquid helium. The studies of these modifications are of intrinsic interest as they provide fundamental data about the properties of liquid helium and may be relevant to eventual chemical reactions that take place in the ultra-cold environment of the droplets. This research will be conducted with graduate and undergraduate students and postdoctoral research associates. They will acquire knowledge and training in one of the forefront areas of physical chemistry in preparation for entry into the scientific/technical workforce.

在这个由化学部实验物理化学计划资助的项目中，Janda将在0.4K的温度下研究嵌入在液氦液滴中的分子和团簇中的IVR过程，将开发适当的皮秒泵浦-探测技术和脉冲阀技术，用于制备反应物和监测团簇内部的化学动力学。当气体冷却到非常低的温度时，它们通常会凝结为液体或固体。当被困在超冷的液氦液滴中时，分子和团簇在很大程度上保持了它们的旋转和振动自由度。由于它们与周围的液氦浴液之间的弱相互作用，它们在常温下表现出来的性质只有轻微的改变。对这些修饰的研究具有内在的兴趣，因为它们提供了关于液氦性质的基本数据，并可能与在液滴的超冷环境中发生的最终化学反应有关。这项研究将在研究生和本科生以及博士后研究助理中进行。他们将获得物理化学前沿领域之一的知识和培训，为进入科学/技术工作大军做准备。