Studies of Vibrational Dynamics

振动动力学研究

• 批准号: 8717046
• 负责人: J. McDonald
• 金额: $ 48.24万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8717046&HistoricalAwards=false
• 关键词: Studies; Vibrational; Dynamics

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.

该实验物理化学项目旨在阐明振动和旋转能量沉积在通过自由射流膨胀冷却至低温的孤立分子中时的流动。 J.D. McDonald 博士将结合激光光谱和自由射流膨胀技术进行各种实验，以探测分子内振动弛豫过程。 一项实验将使用可见光或紫外线受激发射泵浦光谱来测量 α-二羰基分子基电子态的分子本征态光谱。 第二个实验将使用红外泵浦-可见光探针双共振来获得类似的信息，并通过研究激发分子的可见荧光来了解松弛“浴态”的性质。 第三个实验将通过光谱解析红外荧光来探测与前一个实验相同的分子中浴态的不同子集。 最后一个实验将尝试在皮秒尺度上进行许多相同类型的时间分辨率研究。 总的来说，这四种技术将提供几个分子系统中分子内振动和旋转弛豫过程的非常完整的视图。