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

加州大学戴维斯分校的Cheuk-Yiu Ng得到实验物理化学计划的支持，进行高分辨率光电离效率（PIE）、脉冲场电离-光电子（PFI-PE）、和PFI-PI或PFI-PE-光离子符合（PFI-PEPICO）利用独特的真空紫外（VUV）同步加速器研究小碳团簇和选定的过渡金属团簇和过渡金属配位物种-的和真空紫外和红外激光为基础的仪器和实验方案。 化学上重要的碳簇、过渡金属簇和过渡金属配位化合物及其离子的结构、稳定性和反应性的表征继续引起科学界的极大兴趣。 尽管许多先前的实验和理论的努力，能量和光谱信息，如电离能，键离解能，和振动频率的许多这些物种和它们的阳离子仍然没有得到很好的确定。 这些数据对于了解这些化合物的物理和化学性质非常重要。 小碳团簇及其阳离子在碳星、彗星、星际分子云和碳氢化合物火焰的化学研究中具有重要意义。 过渡金属簇合物和过渡金属配位分子由于其在催化中的重要性而引起人们的关注。 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，该项目将有助于教育和培训下一代研究人员开发真空紫外激光器及其化学应用。 电磁波谱的真空紫外区被认为是纳米技术和生物医学研究发展的关键组成部分。

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.