Direct IR Laser and Double Resonance Absorption Spectroscopyin Slit Supersonic Jets: Vibrational Dynamics of Novel Molecular Clusters

狭缝超音速射流中的直接红外激光和双共振吸收光谱：新型分子簇的振动动力学

• 批准号: 9000641
• 负责人: David Nesbitt
• 金额: $ 43.35万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-01 至 1996-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000641&HistoricalAwards=false
• 关键词: Direct; IR; Laser; Double; Resonance

With support from the Experimental Physical Chemistry Program, Professor Nesbitt is investigating the spectroscopy, structure, and dynamics of jet cooled, weakly bound molecular complexes. This work exploits high resolution spectroscopic information on vibrational transitions to help characterize and understand the weak molecular forces so crucial to a variety of chemical, biological, and physical processes. Using a combination of high sensitivity differential beam absorption techniques with multipass infrared probe geometries and pulsed slit valves for long pathlength absorptions, Nesbitt's laboratory is measuring high resolution, sub-Doppler vibrational spectra of various jet cooled complexes. Systems being studied include van der Waals and hydrogen-bonded dimers, dimers of polyatomic molecules, and diatomic molecules bound to several rare gas atoms. Rotationally-resolved vibrational overtone motions are being pumped and characterized by infrared-infrared double resonance techniques in hydrogen-bonded complexes and the resulting photofragments probed for internal state distributions. Intermolecular potential information for multidimensional potential surfaces is being extracted using quantum mechanical simulations of the observed high resolution spectral data.

在实验物理化学计划的支持下， 奈斯特教授正在研究 和动力学的喷射冷却，弱结合的分子复合物。 这项工作利用高分辨率光谱信息， 振动过渡，以帮助表征和理解 弱分子力对各种化学物质至关重要， 生物和物理过程。 采用高灵敏度差分光束组合 具有多通红外探针几何形状的吸收技术 以及用于长路径长度反射的脉冲狭缝阀， 奈瑟的实验室正在测量高分辨率的亚多普勒 各种射流冷却复合物的振动光谱。 系统 正在研究的包括货车德瓦耳斯和氢键二聚体， 多原子分子的二聚体，以及与 稀有气体原子 旋转分辨振动 泛音运动被泵送，其特征在于 红外-红外双共振 氢键复合物和由此产生的光碎片 探索内部状态分布。 分子间 多维势面的势信息 是用量子力学模拟 高分辨率光谱数据。