Structure and dynamics of molecular and cluster anions via photoelectron imaging spectroscopy

通过光电子成像光谱研究分子和团簇阴离子的结构和动力学

• 批准号: 1011895
• 负责人: Andrei Sanov
• 金额: $ 44.9万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1011895&HistoricalAwards=false
• 关键词: Structure; dynamics; molecular; cluster; anions

In this project, supported by the Chemical Structure, Dynamics and Mechanisms Program of the Chemistry Division, Professor Sanov and his students will undertake a study of the structure and dynamics of negative ions in the gas phase. The broad objective of this research is to attain a molecular-level view of chemistry. As chemical bonding is controlled by electrons, it is their behavior that ultimately controls the outcomes of chemical reactions. The bonding motifs in molecular and cluster anions will be investigated using experimental techniques targeting electron emission and anionic fragmentation processes. In particular, a quantum photographic technique - photoelectron imaging - will be used to investigate the limits of through-space and through-bond electronic coherence, which is a cornerstone of many charge-transfer phenomena. The reactivity of selected neutral radicals and reactive intermediates, as well as the interactions of negative ions and photoelectrons with neighboring molecules in microscopic solvation environments (clusters) will also be studied.The knowledge attained in this research is expected to be relevant to several areas of physical sciences. The properties of negative ions are vital to understanding chemistry of solutions, bio-, environmental, and astro-chemistry. For example, characterizing several carbon-rich species will shed light on the mechanisms of formation of negative ions in the Universe, while the studies of electronic coherence at the molecular level will help understand the fundamental factors controlling the flow of charges in molecules and devices. As part of the broader scientific community, the Sanov group will continue advancing the utility of photoelectron imaging in providing conceptual views of bonding structures, which ultimately hold matter together. The research will also contribute to the development of photoelectron imaging's untapped potential as an effective teaching tool, by providing a pedagogical framework for introducing students to quantum concepts.

在这个项目中，由化学系的化学结构，动力学和机制计划的支持下，Sanov教授和他的学生将进行气相负离子的结构和动力学的研究。 这项研究的广泛目标是获得化学的分子水平的观点。 由于化学键是由电子控制的，因此它们的行为最终控制了化学反应的结果。 在分子和簇阴离子的键合图案将使用针对电子发射和阴离子碎裂过程的实验技术进行研究。 特别是，量子摄影技术-光电子成像-将被用来调查通过空间和通过键电子相干性的限制，这是许多电荷转移现象的基石。 此外，还将研究选定的中性自由基和活性中间体的反应性，以及负离子和光电子在微观溶剂化环境（团簇）中与邻近分子的相互作用。本研究所获得的知识预计将与物理科学的多个领域相关。负离子的性质对于理解溶液化学、生物化学、环境化学和天体化学至关重要。 例如，表征几种富碳物种将揭示宇宙中负离子的形成机制，而在分子水平上对电子相干性的研究将有助于理解控制分子和设备中电荷流动的基本因素。 作为更广泛的科学界的一部分，Sanov小组将继续推进光电子成像在提供键合结构的概念视图方面的实用性，这些键合结构最终将物质结合在一起。 该研究还将有助于开发光电子成像作为有效教学工具的未开发潜力，为学生介绍量子概念提供教学框架。