报告题目：Probing the Actinide-Ligand Binding and the Electronic Structure of Actinide Molecules and Clusters Using Photoelectron Spectroscopy
报 告 人：Prof. Lai-Sheng Wang (王来生教授); (Brown University, USA)
报告时间：2016年5月23日（星期一）上午10:00
报告地点：学术活动中心307

报告内容：
The electronic structures of actinide systems are extremely complicated and pose considerable challenges both experimentally and theoretically, because of strong electron correlation and relativistic effects. Photoelectron spectroscopy provides unique experimental electronic structure information, that can be used to compare with theoretical calculations and validate theoretical methods. We have developed a research program to investigate the actinide-ligand binding and the electronic structures of actinide species using anion photoelectron spectroscopy. Electrospray ionization is used to produce solution-phase actinide molecules and multiply-charged anions in the gas phase, whereas the laser-vaporization supersonic molecular beam technique is used to generate low-oxidation state actinide-containing molecules and clusters. Photoelectron spectroscopy of negatively charged ions yields electron affinities and electronic structure information about neutral species. In this talk, I will give an overview of our investigations on uranyl complexes ([UO2L4]2? and [UO2L3]?), uranium fluoride and chloride molecules (UFx? and UClx?), and uranium oxide species (UOx?). I will also mention our recent development of a high-resolution photoelectron imaging apparatus that provides much more accurate electronic structure data, as well as vibrational information.

报告人简介：
Lai-Sheng Wang is an experimental physical chemist interested in the study of nanoclusters and solution-phase chemistry in the gas phase. He received his B.S. degree in Chemistry from Wuhan University in 1982 and his Ph.D. in Chemistry from the University of California at Berkeley in 1990. After a postdoctoral stay at Rice University, he took a joint position between Washington State University and Pacific Northwest National Laboratory in 1993, then accepted an appointment at Brown in 2009. Prof. Wang's research focuses on the investigation of the fundamental behaviors of nanoclusters using photoelectron spectroscopy and computational techniques. Research in his group has led to the discovery of golden buckyballs and the smallest golden pyramid, as well as aromatic clusters and planar boron clusters. Prof. Wang's group has also pioneered spectroscopic studies in the gas-phase of free multiply-charged anions and complex solution-phase anions, such as metal complexes, redox species, and biologically-relevant molecules.
http://casey.brown.edu/chemistry/research/LSWang/people/people.html