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.

在化学系实验物理化学项目的这个项目中，耶鲁大学的帕特里克·瓦卡罗（Patrick Vacarro）将利用新开发的高分辨率激光光谱方法来探索许多多原子系统（包括稳定和不稳定）的基态势能超曲面物种。 这种简并四波混频 (DFWM) 技术依赖于气相分子系综中瞬态空间光栅的同时创建和检测，与传统光谱学相比具有多种优势。 当前的项目将提供有关具有非常高激发振动旋转水平的分子的结构和动力学的信息，这可以增强对与高激发多原子物种有关的分子内和分子间过程的理解，例如预解离和基态异构现象。 %%% 振动键中含有大量能量的多原子分子对多种现象具有重要影响，例如燃烧诊断和大气建模。 这项研究建议使用基于激光的技术来研究具有相当大振动激发的小型瞬态多原子分子，以确定它们因过量能量而产生的行为。