Topic:Experimental Study on collision dynamics of atoms, molecules and clusters

Speaker: Professor Ren Xueguang, Xi'an Jiaotong University

Introduction:

Bachelor's degree and doctor's degree obtained in Xi'an Jiaotong University (2000) and Tsinghua University (2005). From 2005 to 2015, he worked as a postdoctoral, researcher and independent PI researcher in the 11th University of Paris in France, Marple Institute in Germany and PTB in Germany. In January 2016, he returned to work and won the national special youth talent program. He is now a professor in the school of physics of Xi'an Jiaotong University. He mainly carry out electron, ion and Ultrafast Intense Field Laser experiments to study the collision dynamics of atoms, molecules and clusters. He has published more than 100 papers in Nature Physics, Nature Communication, Physical Review Letter and other international famous academic journals, and won the national 100 Excellent Doctoral Thesis Award, research award of German foundation for scientific research (DFG), etc.

Abstract:

The experimental research on the collision dynamics of electrons with atoms, molecules and clusters, on the one hand, can explore the most basic multi-body interaction in quantum physics from the dynamic measurement level, and reveal the structural information of matter; On the other hand, the study of electron impact process provides a basis for understanding the physical mechanism and key scientific issues in the fields of atmospheric and environmental physics, plasma science, nuclear fusion, radiation medicine and so on. A series of complete dynamics experiments were carried out by using the self-designed multi particle coincidence imaging spectrometer (Response spectrometer: Reaction Microscope, COLTRIMS) combined with photocathode pulsed electron beam and fs laser technology. This report will introduce the recent research achievements in molecules and clusters: 1) absolute measurement of ionization cross sections of water and biomolecules by electron impact; 2) The catalytic effect of water environment on the fragmentation of biomolecules, and the cluster effect of organic molecules; 3) Direct evidence of charge and energy transfer in AR dimer is obtained by five body coincidence experiment; 4) The phenomenon of ultrafast energy transfer between biomolecules was observed, and a potential radiation medical scheme was proposed; 5) The ultrafast molecular rotation in acetylene dimer was studied by pump probe experiment and molecular dynamics simulation.

Time: 9:00, June 4, 2021 (Friday)

Report location: Meeting Room 504, Life Science Building

Hosted by: Institute of Atomic and Molecular Physics