材料科学进展6.2（报告人： P. Jena）
发布时间: 2010-06-01 03:32:00
报告内容摘要
Electron affinity, defined as the amount of energy necessary to remove an electron from an anion, plays a dominant role in reactivity. This is evidenced by halogen atoms whose electron affinities are larger than those of any other element in the periodic table. However, there exists a class of molecules whose electron affinities are even larger than those of halogen atoms. These molecules, referred to as superhalogens, typically consist of a central metal atom and several peripheral halogen or oxygen atoms. Using theoretical calculations based on density functional theory and experiments involving photoelectron spectroscopy we demonstrate that an entirely new class of electronegative species, which we term as “hyperhalogens”, can be created when halogen atoms are replaced by superhalogens as building blocks. These hyperhalogens can have electron affinities even larger than those of their superhalogen building blocks, thus opening the door to the synthesis of new materials.
报告人简介
Professor Jena received his Ph.D. in physics from University of California, Riverside, California, 1970. He was promoted to a full professor in Virginia Commonwealth University in 1982, and appointed as a Distinguished Professor of Physics since 2005. Professor Jena has made tremendous contributions to physics in many fields, including cluster physics, chemical physics, energy physics. He was the first one for proposing the idea of using a magic cluster as a super atom to assemble nano materials, and he was the first one studying the mechanism of non-transition metal ions for hydrogen adsorption, which has been used as one of main strategies for hydrogen storage. Besides his outstanding research, he also involved many academic and social services: he served as a Senior Science Advisor in US Department of State, a program director in the Condensed Matter Theory Program at the National Science Foundation, a Chairman of the Physics Department at Virginia Commonwealth University. As a chairman, he has organized 15 international conferences, and as an invited speaker, he has made more than 100 invited talks.
主持人：罗锋特聘研究员
时 间：6月2日（周三）下午15:30
地 点：2教404
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