Studies of Vibrational Dynamics

实验物理化学中的这个项目是设计的 为了阐明振动和旋转能量的流动， 它以孤立的分子形式沉积， 通过自由喷射膨胀实现低温。 J. D.博士麦克唐纳将进行多种实验 使用激光光谱和自由射流的组合 膨胀技术来探测分子内的振动 松弛过程 一个实验将使用可见或 紫外受激发射泵浦光谱测量 基态电子的分子本征态谱 α-二羰基分子的状态。 第二个实验将 利用红外泵浦-可见光探测双共振 类似的信息，并了解的性质， 放松“浴状态”通过研究可见荧光的 被激发的分子 第三个实验将探索 在相同的分子中的浴状态的不同子集， 之前的实验通过光谱解析他们的红外线 荧光。 最后一个实验将尝试许多 时间分辨率为皮秒的同类研究 规模 这四种技术将共同提供一个非常 分子内振动和转动的完整视图 几种分子系统的弛豫过程。

This project in Experimental Physical Chemistry is designed to elucidate the flow of vibrational and rotational energy when it is deposited in isolated molecules which have been cooled to low temperatures by free-jet expansion. Dr. J. D. McDonald will conduct a variety of experiments using a combination of laser spectroscopic and free-jet expansion techniques to probe the intramolecular vibrational relaxation process. One experiment will use visible or ultraviolet stimulated emission pumping spectroscopy to measure the spectrum of molecular eigenstates in the ground electronic state of alpha-dicarbonyl molecules. A second experiment will use infrared pump-visible probe double resonance to gain similar information and to learn about the nature of the relaxed "bath states" by studying the visible fluorescence of the excited molecules. A third experiment will probe a different subset of the bath states in the same molecules as the previous experiment by spectrally resolving their infrared fluorescence. The last experiment will attempt many of the same types of studies with time resolution on a picosecond scale. Collectively these four techniques will provide a very complete view of the intramolecular vibrational and rotational relaxation process in several molecular systems.