时间：2023年3月31日（周五）14:00~15:30

Time：2:00-3:30 PM, Friday, Mar. 31, 2023

地点：西湖大学云谷校区E10-222

Venue: E10-222, Yungu Campus

主持人：西湖大学理学院 王鸿飞教授

Host: Professor Hongfei Wang, School of Science

主讲人/Speaker：

Xueming Yang

Distinguished Fellow, Dalian Institute of Chemical Physics, CAS.

Chair Professor, Southern University of Science and Technology

报告题目/Title:

Quantum Nature of Chemical Reactivity

讲座摘要/Abstract:

Quantum effects in chemical reactions have been a fundamental topic in chemical reactions.  Over the last two decades, we have made significant progresses in two important topics in this research direction: reaction resonances and geometric phase effects.  We have developed quantum state resolved crossed molecular beams methods to study both problems.  Using the quantum state resolved backward scattering spectroscopy methods, we are able to probe reaction resonances in a number of elementary chemical reactions in unprecedented clarity and accuracy.  This pushes our understanding of reaction resonances to a much high level.  

Geometric phase effect was long predicted theoretically could have a significant effect in the dynamics of chemical reactions with conical intersections.  However, experimental observation of such effect proves to be extremely difficult and fruitless. Recently, geometric phase effect in the H+HDH2+D reaction was observed clearly at collision energy near the conical intersection of this reaction using the high resolution threshold ionization - imaging technique. In addition, we have also detected experimental evidence of geometric phase effect, through energy dependent quantum-state-resolved DCS oscillations due to quantum interference between topological pathways, at collision energies significantly below the conical intersection energy using high resolution H-atom Rydberg tagging crossed molecular beams method. These new experiments in combination with accurate quantum dynamics calculations allows us to probe and understand this interesting quantum effect in chemical reactions at the most fundamental level. 

讲座联系人/Contact:

科技合作部 sci-tech02@westlake.edu.cn