Coherent Light Scattering Spectroscopy: A New Probe for Vibrationally Excited Species

相干光散射光谱：振动激发物种的新探针

• 批准号: 9207835
• 负责人: Patrick Vaccaro
• 金额: $ 26.5万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9207835&HistoricalAwards=false
• 关键词: Coherent; Light; Scattering; Spectroscopy; New

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Patrick Vacarro of Yale University will exploit a newly developed high-resolution laser spectroscopic method to explore the ground state potential energy hypersurfaces for a number of polyatomic systems, including both stable and unstable species. This degenerate four-wave mixing (DFWM) technique relies on the simultaneous creation and detection of transient spatial gratings within a gas-phase ensemble of molecules and offers several advantages over traditional spectroscopies. The current project will furnish information on the structure and dynamics of molecules with very highly excited vibration-rotation levels which can lead to an enhanced understanding of the intra- and intermolecular processes involved with highly excited polyatomic species, such as predissociation and ground-state isomerism. %%% Polyatomic molecules which contain large amounts of energy in vibrating bonds have an important impact on a wide variety of phenomena, such as combustion diagnosis and atmospheric modelling. This study proposes to user laser-based techniques to study small transient polyatomic molecules possessing considerable vibrational excitation to determine their behavior as a result of the excess energy.

在这个实验物理化学项目中， 耶鲁大学化学系的帕特里克瓦卡罗 将利用新开发的高分辨率激光器 探索基态势的光谱方法 许多多原子系统的能量超曲面， 包括稳定和不稳定的物种。 这个堕落的人 四波混频（DFWM）技术依赖于同时 产生和检测瞬态空间光栅 气相分子系综，并提供了几个优点 而不是传统的光谱学。 目前的项目将 提供有关分子结构和动力学的信息 具有非常高的振动旋转水平， 有助于加深对内部和 分子间过程涉及高激发态 多原子物种，如预解离和基态 异构现象 %%% 含有大量能量的多原子分子， 振动键对各种各样的 现象，如燃烧诊断和大气 建模 本研究向用户提出了基于激光的技术 研究具有瞬时多原子的小分子 相当大的振动激发来决定它们的行为 因为能量过剩。