NSF Young Investigator: Photoinitiated Reactions in Ion-Molecule Complexes

在NSF青年研究者奖下，Seung Koo Shin教授将研究过渡态附近离子分子复合物中的光引发反应。由电荷诱导的偶极相互作用弱持有的离子反应中间体在离子阱中被隔离或用离子反射器大量选择。状态选择激光光谱研究提供了离子-分子复合物介导的化学过程的结构和动态信息，如SN2，电荷转移和定向轨道反应。利用现有的实验技术，Shin将能够在微观层面上研究当一个分子（有时是称为离子的带电粒子）与另一个中性分子发生反应时会发生什么。所形成的弱分子结合称为络合物。对这些配合物的研究提供了关于反应如何发生的信息，以及在给定的起始条件下会产生什么产物。这些研究具有广泛的应用，特别是对大气过程，包括那些涉及烟雾的形成和温室气体的破坏。

Under this NSF Young Investigator Award Professor Seung Koo Shin will examine photoinitiated reactions in ion-molecule complexes near the transition state. Ionic reaction intermediates weakly held by charge-induced dipole interactions are isolated in an ion trap or are mass-selected with an ion reflector. State-selective laser spectroscopic studies provide details of structural and dynamic information about ion-molecule complex mediated chemical processes such as SN2, charge-transfer, and oriented orbital reactions. %%% With the experimental techniques available to him, Shin will be able to examine on a microscopic level what happens when one molecule, sometimes an electrically charged particle called an ion, reacts with a different neutral molecule. The weak molecular associations which are formed are called complexes. The study of these complexes gives information about how reactions occur, and what products result under given starting conditions. These studies have broad application, especially to atmospheric processes, including those involved in the formation of smog an the destruction of greenhouse gases.