Vacuum ultraviolet pulsed field ionization-photoelectron and photoion studies of small carbon clusters and transition metal-ligated species

小碳簇和过渡金属连接物质的真空紫外脉冲场电离-光电子和光电子研究

• 批准号: 0517871
• 负责人: Cheuk-Yiu Ng
• 金额: --
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0517871&HistoricalAwards=false
• 关键词: Vacuum; ultraviolet; pulsed; field; ionization

Cheuk-Yiu Ng of the University of California-Davis is supported by the Experimental Physical Chemistry Program to perform high-resolution photoionization efficiency (PIE), pulsed field ionization-photoelectron (PFI-PE), and PFI-photoion (PFI-PI) or PFI-PE-photoion coincidence (PFI-PEPICO) studies of small carbon clusters and selected transition metal-clusters and transition metal-ligated species using unique vacuum ultraviolet (VUV) synchrotron-based and VUV and infrared laser-based instrumentation and experimental schemes. Characterization of the structures, stabilities, and reactivity of chemically significant carbon clusters, transition metal clusters, and transition metal-ligated compounds and their ions continue to elicit much interest in the scientific community. Despite much prior experimental and theoretical effort, energetic and spectroscopic information such as ionization energies, bond dissociation energies, and vibrational frequencies for many of these species and their cations is still not well determined. Such data are important for understanding the physical and chemical properties of these compounds. Small carbon clusters and their cations are of great interest for the chemistry of carbon stars, comets, interstellar molecular clouds, and hydrocarbon flames. Transition metal clusters and transition metal-ligated molecules attract attention because of their fundamental importance to catalysis. Outcomes from this research will lead to new and useful insights into these molecular systems. As well, this project will assist in the education and training of the next generation of researchers in the development of VUV lasers and their chemical applications. The VUV region of the electromagnetic spectrum is recognized as a key component for the development of nanoscale technologies and biomedical research.

加州大学戴维斯分校的吴卓耀获实验物理化学计划资助，进行高解析度光离效率（PIE）、脉冲场电离光电子（PFI-PE）、和pfi -光子离子（PFI-PI）或pfi - pe -光子离子重合（PFI-PEPICO）研究小碳团簇和选择的过渡金属团簇和过渡金属连接的物种使用独特的真空紫外（VUV）同步加速器和VUV和红外激光为基础的仪器和实验方案。化学上重要的碳团簇、过渡金属团簇、过渡金属连接化合物及其离子的结构、稳定性和反应性的表征一直引起科学界的极大兴趣。尽管前人在实验和理论方面做了大量的努力，但这些物质及其阳离子的能量和光谱信息，如电离能、键解能和振动频率，仍然没有得到很好的确定。这些数据对于理解这些化合物的物理和化学性质是很重要的。小碳团簇及其阳离子对碳星、彗星、星际分子云和碳氢化合物火焰的化学性质具有极大的兴趣。过渡金属簇和过渡金属连接分子因其在催化过程中的重要作用而备受关注。这项研究的结果将导致对这些分子系统的新的和有用的见解。此外，该项目将协助教育和培训下一代研究人员开发VUV激光器及其化学应用。电磁波谱的VUV区域被认为是纳米技术发展和生物医学研究的关键组成部分。