Vibrational Spectroscopy at 4eV and Beyond

在这个实验物理化学项目中， 普林斯顿大学的凯文·莱曼 大学将开发两种光谱工具， 研究分子内振动能量再分布（IVR） 在小的多原子分子中。 第一种技术是 光-光双共振方法， 基态的高振动激发能级 为了研究大规模的 振动运动的非谐性。 另一种技术 是一种时间分辨的红外泵浦/拉曼探测方法， 探索振动后的最终IVR分布 氢原子的激发拉伸。 最后，莱曼将 开发理论工具来解释新获得的 谱 %%% 对大量振动的影响的理解 分子中的激发直接影响我们对 许多反应的基本过程 发生. 在这项研究中，莱曼将研究 分子中键运动的振动能， 以及阐明这种过量的 能量被耗散。 这些信息对基本的 了解许多反应过程，从大气 从化学到燃烧再到等离子体合成

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Kevin Lehmann of Princeton University will develop two spectroscopic tools to aid in studying intramolecular vibrational energy redistribution (IVR) in small polyatomic molecules. The first technique is an optical-optical double resonance method which allows very highly vibrationally excited levels of the ground state to be populated in order to study the effect of the large anharmonicity on the vibrational motion. The other technique is a time-resolved, infrared-pump/Raman probe method for exploring the final IVR distributions after vibrational excitation of hydrogen atom stretches. Finally, Lehmann will develop theoretical tools to interpret the newly acquired spectra. %%% An understanding of the effects of large amounts of vibrational excitation in a molecule directly impacts our understanding of the fundamental processes by which many types of reactions occur. In this research Lehmann will study the effects of vibrational energy on the motions of bonds in a molecule as well as the elucidation of the pathways by which this excess energy is dissipated. This information has impact on the basic understanding of many reactive processes, from atmospheric chemistry to combustion to synthesis using plasmas.