Infrared Laser Spectroscopy

红外激光光谱

• 批准号: 9213681
• 负责人: Robert Curl
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-02-15 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9213681&HistoricalAwards=false
• 关键词: Infrared; Laser; Spectroscopy

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Curl and Tittel of Rice University will investigate the high resolution infrared spectra of free radical species using infrared kinetic spectroscopy. The absorption infrared spectra of free radicals prepared using excimer laser photolysis is obtained using a single-frequency continuous-wave infrared probe laser by means of a difference frequency generation scheme developed previously by these investigators. Transient radicals to be studied include C4H, HCCO (ketenyl), HCCCO (propynonyl), and HCCCH (propargylene). A technique for observing the high resolution spectra of radicals cooled in a supersonic jet expansion will continue to be developed and applied to analyzing the CO stretching vibrations in CH2OH (hydroxymethyl). %%% Free radicals are highly reactive, transient species which are produced as intermediates in many different chemical reactions. In this research project transient free radicals will be produced, and their characteristic absorptions of infrared radiation, that is, their vibrational spectra, will be examined for the information they can provide on the structure and nature of these short-lived species. Such information has a bearing on the fundamental nature of chemical bonding in these important reaction intermediates and impacts our understanding of such diverse areas as combustion reactions and molecules in interstellar media.

在化学系实验物理化学项目中，莱斯大学的柯尔和蒂特尔将利用红外动力学光谱研究自由基物种的高分辨率红外光谱。用单频连续波红外探测激光器，通过研究人员先前开发的差频产生方案，获得了用准分子激光光解制备的自由基的吸收红外光谱。要研究的瞬时自由基包括C4H、HCCO(酮基)、HCCCO(丙基)和HCCCH(丙烯)。超音速射流膨胀冷却自由基高分辨光谱的观测技术将继续发展，并应用于分析CH2OH(羟甲基)中的CO伸缩振动。%自由基是一种高活性的瞬时物种，在许多不同的化学反应中作为中间体产生。在这项研究项目中，将产生瞬时自由基，并将检查它们对红外辐射的特征吸收，即它们的振动光谱，以寻找它们可以提供关于这些短暂物种的结构和性质的信息。这些信息关系到这些重要反应中间体中化学键的基本性质，并影响我们对燃烧反应和星际介质中分子等不同领域的理解。