讲座题目：Spectra of doped helium nanodroplets, helium clusters, and hydrogen clusters: Structure and dynamics of quantum solvated systems
主讲人:Prof.Wolfgang Jäger
讲座时间：2017.5.1115:00-16:00
讲座地点：理科大楼A814室
报告人简介：
Wolfgang Jäger received his PhD degree in Chemistry from the Christian Albrechts University in Kiel, Germany, in 1989. He joined the Department of Chemistry at the University of Alberta, Edmonton, Canada, in 1995 after spending time as postdoctoral fellow and research associate at the University of British Columbia, Vancouver, Canada. He was promoted to Associate Professor in 2001 and to the rank of Full Professor in 2003.
Professor Jäger’s research is multifaceted and includes fundamental studies of intermolecular interactions using spectroscopic investigations of weakly bound complexes and clusters, development of atmospheric trace gas sensing techniques that utilize solid state infrared diode lasers, photoreaction chamber studies of aerosol formation, and design and fabrication of external cavity lasers using MEMS technology. His work has resulted in more than 160 publications thus far.
For his scientific achievements, Professor Jäger was awarded the NSERC Steacie Memorial Fellowship in 2002, in 2004 he became a Tier I Canada Research Chair in Cluster Science which was renewed in 2011, and in 2008 he was elected Fellow of the Royal Society of Canada. From 2009 to 2010, he spent a sabbatical year at the Fritz Haber Institute of the Max Planck Society in Berlin, Germany, which was funded by a prestigious Humboldt Fellowship.
报告摘要：
High resolution rotational and ro‐vibrational spectroscopic studies have shown that effects of superfluidity, which is formally a bulk phase property, occur already in rather small doped heliumclusters. For example, the rotational constant B of He NOCS clusters initially decreases with increasingcluster size, but “turns around” at N=8. This turn‐around in B is interpreted as a decoupling of helium density from the rotational motion of the dopant molecule and theoretical simulations confirm thatthis is a signature of “microscopic superfluidity”. Recent measurements on (paraH 2 ) N ‐CO clusters provide evidence for superfluidity in molecular para hydrogen. In this talk, some of the earlier studies will be reviewed.In the second part of the talk, some of our efforts to embed reactive molecules in helium nanodropletswill be presented. The goal of these studies is to use the helium nanodroplets as cold chemical nano‐ reactors to study low barrier or barrierless reactions. Hydrogen peroxide was doped into helium nanodroplets to be ultimately used as a precursor for the hydroxyl radical. Our infrared spectroscopicstudy of H 2 O 2 in the symmetric and antisymmetric OH stretching region will be described.
