Structure and Chemistry of Gas Phase Atomic Clusters

气相原子团簇的结构和化学

• 批准号: 9306900
• 负责人: Martin Jarrold
• 金额: $ 45.71万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9306900&HistoricalAwards=false
• 关键词: Structure; Chemistry; Gas; Phase; Atomic

In this project in the Physical Chemistry program of the Chemistry Division, Prof. M. Jarrold of Northwestern University will study the structure and chemistry of gas phase atomic clusters. Geometric structures, structural isomers, and structural transitions will be determined with an improved ion-chromatography technique. Additionally, information will be obtained on previously inaccessible features such as cluster annealing and the temperature at which clusters isomerize and undergo a phase transition. Thermal desorption measurements on clusters will be used to unravel the chemistry that occurs on the nano-surfaces of atomic clusters, and to determine accurate dissociation energies and ligand binding energies. Specific cluster systems to be studied will include large fullerene-type carbon clusters composed of more than 100 carbon atoms and semiconductor clusters. %%% Clusters of atoms (and molecules) constitute a form of aggregated matter that bridges the traditional conceptual boundary between the condensed (solid or liquid) and gaseous states of aggregation. Because the physical and chemical properties of clusters differ from those of the condensed or gaseous phases of the concerned material, the study of cluster properties is of fundamental interest. In addition to the exploration of cluster properties for their intrinsic interest, there is strong coupling to the technological applications of clusters. Fullerenes, or buckyballs, are clusters in which the constituent atoms arrange themselves to form three dimensional geodesic structures. The appellation fullerene (or buckyball) is given to this type of cluster in recognition of Buckminster Fuller who is known for his designs of geodesic domes. Fullerenes are now recognized to constitute a new, third form of carbon in addition to the well known forms graphite and diamond. Their physical and chemical properties are intensively investigated to increase our knowledge about them and to exploit it for technological applications.

在这个项目中的物理化学计划的 化学部，M.西北大学的Jarrold 将研究气相原子的结构和化学 集群 几何结构、结构异构体和 结构转型将通过改进的 离子色谱技术 此外，信息将 在以前无法访问的功能上获得，例如群集 退火和温度在集群异构化和 经历相变。 热脱附测量 簇将被用来解开发生在 原子团簇的纳米表面，并确定准确的 解离能和配体结合能。 具体 要研究的簇系统将包括大型富勒烯型 由100个以上碳原子组成的碳簇， 半导体集群 %%% 原子（和分子）簇构成了一种形式的 聚合物，它将传统的概念 冷凝（固体或液体）和气体之间的边界 聚集状态。 因为物理的和化学的 团簇的性质不同于凝聚态或 有关物质的气相，团簇的研究 财产是根本利益。 除了有 探索集群的性质，为他们的内在利益， 与以下技术应用有很强的耦合性： 集群 富勒烯，或巴基球，是一种簇， 组成原子排列成三维的 测地线结构 富勒烯（或巴基球）的称谓 是给这种类型的集群，以表彰巴克 富勒以他的测地线圆顶设计而闻名。 富勒烯现在被认为是一种新的第三种形式 除了众所周知的石墨形式外， 钻石 它们的物理和化学性质 被深入研究，以增加我们对 并将其用于技术应用。