Vibrational Potential Energy Surfaces and Molecular Structures in Electronic Excited States

在化学系物理化学计划的这个项目中，德克萨斯农工大学化学系的Jan Laane教授将进行研究，以确定激发电子态的振动势能面。将采用的实验技术包括荧光激发光谱、敏化磷光光谱和超音速喷射冷却分子的双光子光谱。体系物种包括环状分子和多环分子，以及具有内旋或反转的分子，包括各种羰基化合物和具有两个紧密电子态的“双分子”。还将记录远红外和拉曼光谱，以帮助确定基态电子势能面。分子水平上对分子性质和行为的理解依赖于对分子基态和激发电子态的势能面的准确了解。本项目中进行的研究将为这一理解提供必要的数据和分析。

In this project in the Physical Chemistry program of the Chemistry Division, Professor Jan Laane of the Chemistry Department of Texas A&M University will pursue investigations in order to determine the vibrational potential energy surfaces of excited electronic states. The experimental techniques to be employed include fluorescence excitation spectroscopy, sensitized phosphorescence spectroscopy, and two-photon spectroscopy of supersonic jet-cooled molecules. The system species include cyclic and multicyclic molecules, and those with internal rotations or inversions, including various carbonyl compounds and `double molecules`, i.e., those with two closely lying electronic states. Far infrared and Raman spectra will also be recorded in order to help with the determination of the ground electronic state potential energy surface. Molecular-level understanding of molecular properties and behavior depends upon accurate knowledge of the potential energy surfaces of a molecule for its ground and excited electronic states. The research conducted in this project will furnish the requisite data and analyses toward this understanding.