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U.S.-Germany Cooperative Research on the Correlation betweenthe Nonmetal to Metal Transition in Clusters and at Surfaces

美德合作研究团簇和表面非金属到金属转变之间的相关性

基本信息

批准号：
9300238
负责人：
E. Ward Plummer
金额：
$ 1.99万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1993
资助国家：
美国
起止时间：
1993-09-01 至 1998-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9300238&HistoricalAwards=false
关键词：
U.S.Germany Cooperative Research Correlation

项目摘要

9300238 Plummer This award supports Professors E. Ward Plummer of the University of Tennessee, Peter Dowben of Syracuse University, and N. John DiNardo of Drexel University to collaborate in condensed matter physics with three German counterparts: Professor Klaus Rademann and Dr. Ourania Rademann of the University of Marburg and Dr. Eckart Ruhl of the Free University of Berlin. The purpose of their cooperative research is to develop a picture of the fundamental mechanisms for the nonmetal to metal transition in the simple metals. The collaborative plan brings together three U.S. experimentalists who have done substantial research on the nonmetal transition in two dimensions and at solid surfaces to work with three German experimentalists who have done complementary research on the transition in clusters. The research requires substantial experimental work at a synchrotron light source, as well as access to other very specialized analytical equipment. The German collaborators are able to provide access to the German facility known as BESSY, in Berlin, while the U.S. collaborators will arrange for joint work at the U.S. National Synchrotron Light Source and other U.S. facilities suitable for the very complicated characterizations of alkali metal in surface islands and surface aggregates. Both U.S. and German postdoctoral associates and graduate students will be involved in the collaborative research. Transition metal clusters and aggregates exhibit a nonmetal to metal transition with increasing cluster size. Similar transitions have been observed for transition metal layers on solid surfaces. So far, the in-depth study needed to demonstrate a direct connection between metal to nonmetal transition in clusters and at surfaces has been done successfully only for one metal, mercury. These investigators propose to expand that base of knowledge by undertaking the necessary comparative research on transition in alkali metals. Since data already exist on alkali b ehavior in surface layers, the joint research will focus principally on the transition in clusters. Results from this research will contribute to understanding the basis for the difference in behavior between metals and non-metals. ***

9300238 Plummer 该奖项支持田纳西大学的 E. Ward Plummer 教授、雪城大学的 Peter Dowben 和德雷克塞尔大学的 N. John DiNardo 教授与三位德国同行在凝聚态物理方面进行合作：马尔堡大学的 Klaus Rademann 教授和 Ourania Rademann 博士以及柏林自由大学的 Eckart Ruhl 博士。他们合作研究的目的是描绘简单金属中非金属向金属转变的基本机制。该合作计划汇集了三位对二维和固体表面非金属转变进行了大量研究的美国实验家，与三位对团簇转变进行了补充研究的德国实验家合作。该研究需要在同步加速器光源下进行大量实验工作，以及使用其他非常专业的分析设备。德国合作者能够进入位于柏林的德国 BESSY 设施，而美国合作者将安排在美国国家同步加速器光源和其他适合对表面岛屿和表面聚集体中碱金属进行非常复杂的表征的美国设施进行联合工作。美国和德国的博士后和研究生都将参与合作研究。随着簇尺寸的增加，过渡金属簇和聚集体表现出非金属到金属的转变。固体表面上的过渡金属层也观察到类似的转变。到目前为止，证明团簇和表面金属与非金属转变之间直接联系所需的深入研究仅针对一种金属汞成功完成。这些研究人员建议通过对碱金属的转变进行必要的比较研究来扩大知识基础。由于表层碱行为的数据已经存在，因此联合研究将主要集中在团簇的转变上。这项研究的结果将有助于理解金属和非金属之间行为差异的基础。 ***