报告时间：2013年7月29日（星期一）上午9:00-10:00

报告地点：能源基础楼一楼会议室

报告人：Prof. Lai-Sheng Wang

Department of Chemistry, Brown University, Providence, US

报告摘要：

Clusters are aggregates of atoms, which exhibit size-dependent chemical and physical properties. In my lab, photoelectron spectroscopy of size-selected anions is used to probe the size-dependent structures and electronic properties of a variety of clusters in the size range from a few atoms to hundreds of atoms. In this talk, I will present our studies on gold and boron clusters. Even though bulk gold is the most inert metal, gold nanoparticles less than 5 nm in diameter are found to have remarkable catalytic activities. This finding has stimulated a flurry of studies about the structures and chemical reactivity of well-defined and isolated gold clusters. We have elucidated the structures of size-selected gold clusters with more than 60 atoms and found interesting size-dependent structural variations and chemical reactivity, which provide insight into the catalytic mechanisms of gold nanoparticles. In our study of boron clusters, we have found that they all possess planar or quasi-planar structures, in contrast to bulk boron, which is dominated by three-dimensional cage-like building blocks. The propensity for planarity has been found to be due to both σ and π electron delocalization throughout the molecular plane, giving rise to concepts of σ and π multiple aromaticity. Our very recent work has shown that the central boron atoms can be substituted by transition-metal atoms to form anew class of aromatic boron compounds, which consist of a central metal atom and a monocyclic boron ring (M？Bn). Eight-, nine-, and ten-membered rings of boron have been observed, giving rise to a family of novel borometallic compounds.

报告人简介：

Education

1989 Ph.D. in Physical Chemistry, University of California, Berkeley, California (with

Y. T. Lee and D. A. Shirley)

1982 B.S. in Chemistry, Wuhan University, Wuhan City, PRC

Academic Positions

09.2009 – present Professor, Brown University

08.2002 – 08.2009 Professor, Department of Physics, Washington State University

08.2000 – 08.2009 Professor, Program in Materials Science, Washington State University

08.1998 – 07.2002 Associate Professor, Department of Physics, Washington State University

01.1993 – 07.1998 Assistant Professor, Department of Physics, Washington State University

01.1993 – 08.2009 Affiliate Senior Chief Research Scientist, Pacific Northwest National Laboratory, Richland, Washington

07.1990 – 12.1992 Postdoctoral Research Associate, Department of Chemistry, Rice University (with R. E. Smalley)

01.1990 – 06.1990 Chemist Postdoctoral Fellow, Lawrence Berkeley Laboratory, Berkeley, California (with D. A. Shirley)

09.1983 – 12.1989 Research Assistant, Department of Chemistry, University of California, Berkeley (with Y. T. Lee and D. A. Shirley)

Publications

Over 360 publications in Atomic Clusters, Nanoscience, Chemical Physics, and Molecular Physics. (h-index = 66) (http://www.chem.brown.edu/research/LSWang)

Awards & Honors

2007 American Association for the Advancement of Science (AAAS) Fellow

2007 Sahlin Faculty Excellence Award for Research, Scholarship & Arts, Washington State University

2006 Humboldt Senior Research Award

2005 John Simon Guggenheim Fellow

2005 Distinguished Faculty Award, College of Sciences, Washington State University

2003 Fellow, American Physical Society

2001 Creativity Award, U.S. National Science Foundation

1997 Alfred P. Sloan Research Fellow

1997 Westinghouse Distinguished Professor in Materials Science and Engineering, Washington State University

1996 CAREER Award, U.S. National Science Foundation

报告联系人：502组 石瑛（9128）