Ion Mobility Studies of the Structures of Atomic Clusters

原子团簇结构的离子淌度研究

• 批准号: 9618643
• 负责人: Martin Jarrold
• 金额: $ 49.8万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-01 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9618643&HistoricalAwards=false
• 关键词: Ion; Mobility; Studies; Structures; Atomic

The Experimental Physical Chemistry Program support Martin F. Jarrold in his continuing studies to determine the structure of medium-sized clusters using gas phase ion mobility measurements. The speed with which a gas phase ion moves through a buffer gas under the influence of a weak electric field depends on its geometry. Although some information about the geometries can be deduced from the mobilities, more than one geometry can have the same mobility. Thus, Jarrold proposes to couple a recently-constructed high resolution apparatus with a magnetic-bottle anion photoelectron spectrometer. Using this approach, photoelectron spectra will be measured as a function of geometry and cluster size for carbon, silicon, and germanium clusters of up to hundreds of atoms. Atomic clusters are small pieces of material containing from a few to several thousand atoms. For a variety of reasons, the physical and chemical properties of these species are different than those of the bulk material. Examining the properties and determining how they change as a function of cluster size has been the object of a major research effort for the last ten years. Structure generally controls the physical and chemical properties of any material. Thus information about the geometric structure of atomic clusters is critical for understanding their size-dependent properties. These studies will substantially increase our understanding of the structure and bonding in clusters of the Group 4 (carbon, silicon and germanium) elements.

实验物理化学计划支持马丁F。贾罗德在 他继续研究，以确定结构的中型 簇使用气相离子迁移率测量。 的速度 气相离子在弱离子的影响下移动通过缓冲气体 电场取决于其几何形状。 尽管一些关于 可以从迁移率推导出几何形状，不止一种几何形状 可以有相同的移动性。 因此，Jarrold建议将 最近构造的具有磁瓶的高分辨率装置 阴离子光电子能谱仪 利用这种方法，光电子 光谱将被测量为几何形状和簇大小的函数， 碳、硅和锗的原子簇多达数百个。 原子团簇是一种小的物质， 几千个原子。 由于各种原因，身体和 这些物质的化学性质不同于散装物质 材料 检查属性并确定它们如何作为 团簇大小的函数一直是一个主要的研究工作的对象 都在做这个 结构通常控制物理和 任何材料的化学性质。 因此，关于 原子团簇的几何结构对于理解 它们的大小依赖性。 这些研究将大大 增加我们对结构和成键的理解 第四族元素（碳、硅和锗）。