Optical Absorption Spectroscopy of Metal Containing Molecules

本研究由化学系实验物理化学项目资助。 在三个相关的任务Steimle将：a）检测和表征过渡金属二氧化物使用瞬态频率调制（TFM）光谱; B）检测和表征的激光诱导荧光光谱含铁分子被认为是催化中间体在火焰抑制;和c）执行塞曼和斯塔克光谱表征三维过渡金属一氧化物和一氮化物。 含金属的自由基将使用现有的激光烧蚀/超声膨胀源或直流放电/超声膨胀源产生。 分子种类将通过分析其电子光谱以及光学斯塔克和塞曼光谱分裂来表征。理解过渡金属的氧化反应在化学中具有根本的重要性，并且对许多相关领域如表面科学和冶金学至关重要。 已经发现某些含铁化合物在火焰抑制方面基本上更有效，并且比含卤素化合物更环境友好，其使用正在被逐步淘汰。 该研究将为理解这些主题做出重要贡献。 虽然实验和结果分析是复杂和精密的，但它们有助于在主要研究者的监督下工作的研究生和本科生的参与

This research is funded by the Experimental Physical Chemistry Program of the Chemistry Division. In three related tasks Steimle will: a) detect and characterize transition metal dioxides using transient frequency modulation (TFM) spectroscopy; b) detect and characterize by laser induced fluorescence spectroscopy Fe-containing molecules thought to be catalytic intermediates in flame suppression; and c) perform Zeeman and Stark spectroscopy to characterize 3d transition metal monoxides and mononitrides. The metal-containing radicals will be generated using either an existing laser ablation/supersonic expansion source or a dc-discharge/supersonic expansion source. The molecular species will be characterized through the analysis of their electronic spectra as well as of the optical Stark and Zeeman spectral splittings. Understanding the oxidation reaction of transition metals is both of fundamental importance in chemistry and is crucial to many related areas such as surface science and metallurgy. Certain Fe-containing compounds have been found to be substantially more effective at flame inhibition and are environmentally friendlier than halogen-containing compounds, whose use is being phased out. The proposed research will make important contributions to the understanding of these topics. Although the experiments and the analyses of the results are complex and sophisticated, they lend themselves to the involvement by graduate and undergraduate students who work under the supervision of the principal investigator