Vibrational Dynamics in Weakly-Bound Complexes and Gas- Surface Scattering

在化学系实验物理化学计划的这个项目中，北卡罗来纳大学教堂山分校的R.E.Miller教授将继续研究能量转移的动力学问题，特别是那些存在于弱结合分子络合物和分子-表面相互作用中的问题。对于弱结合络合物，将进行光谱表征，以确定光解动力学和相关势能面的细节，以及光解产生的碎片的态到态探测。这些实验被扩展到气体表面散射的领域，特别是非线性分子的散射以及在这个过程中传递的振动和转动能量。化学反应动力学站在当代物理化学研究的前沿。目的是在分子水平上对反应过程有一个详细的了解。所研究的体系包括稳定分子、由稳定分子组成的弱结合络合物以及在散射过程中与固体表面相互作用的分子。气相分子或络合物在光激发下被提升到高电子、振动或转动能态，通常会解离成具有电子、振动、旋转和平移自由度能量分布特征的碎片。由于通常有几种可能的路径允许离解过程发生，因此了解这些过程的细节是重要的，以便能够正确地对整个反应现象进行建模。类似的原因指导着分子在固体表面上的散射研究，特别是那些在催化反应中发挥作用的表面。

In this project in the Experimental Physical Chemistry program of the Chemistry Division, Prof. R.E. Miller of the University of North Carolina at Chapel Hill will continue a research program on problems of the dynamics of energy transfer, specifically those present in weakly bound molecular complexes and in molecule-surface interactions. For the weakly bound complexes there will be spectroscopic characterization to determine the details of photodissociation dynamics and the associated potential energy surfaces, as well as the state-to-state probing of the fragments resulting from phtodissociation. These experiments are extended into the realm of gas-surface scattering, especially that of scattering of non-linear molecules and the vibrational and rotational energies transferred in this process. The dynamics of chemical reactions stands at the forefront of contemporary research in physical chemistry. The purpose is to obtain a detailed understanding of reaction processes at the molecular level. Systems that are investigated include stable molecules, weakly bound complexes composed of stable molecules, and molecules interacting with solid surfaces in a scattering process. Gas phase molecules or complexes elevated to high electronic, vibrational or rotational states of energy by photoexcitation often dissociate into fragments having characteristic energy distributions in the electronic, vibrational, rotational, and translational degrees of freedom. Since there are usually several possible paths along which a dissociation process is allowed to occur, it is important to understand the details of these processes to allow correct modeling of the overall reaction phenomenon. Similar reasons guide the research in scattering of molecules by solid surfaces, especially those that play a role in catalytic reactions.