State-Resolved Spectroscopy and Dynamics of Chemical Transients

状态分辨光谱和化学瞬态动力学

• 批准号: 0111251
• 负责人: David Nesbitt
• 金额: $ 46.4万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2004-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0111251&HistoricalAwards=false
• 关键词: State; Resolved; Spectroscopy; Dynamics; Chemical

In this proposal funded by the Experimental Physical Chemistry Program of the Chemistry Division, David Nesbitt of the University of Colorado will pursue a program of research on the spectroscopy and dynamics of chemical transients using state-resolved techniques. The project will examine the spectroscopy of transient species, quantum state-selected reaction dynamics, and the development and exploitation of new methods to interrogate jet-cooled transient species. Jet-cooled radicals, molecular ions, and molecular ion clusters will be investigated in slit supersonic discharges using direct absorption infrared laser methods. High sensitivity overtone spectroscopy of clusters and reaction dynamics with aligned or oriented reagents will be studied using IR-UV-UV triple resonance methods. The ultrasensitive visible absorption spectroscopy of jet-cooled chemical transients will be examined using novel optical heterodyne/high finesse cavity methods combined with slit discharge sources. This research program focuses on short-lived molecules and ions that are created under extremely energetic conditions, and thus they usually are not found in nature in stable forms. Besides being of fundamental interest, these studies have practical relevance to solving problems in combustion and atmospheric chemistry as well as in astrophysical chemistry.

在这项由化学学部实验物理化学项目资助的提案中，科罗拉多大学的David Nesbitt将使用状态解析技术进行化学瞬变的光谱学和动力学研究。该项目将研究瞬态物质的光谱，量子态选择反应动力学，以及开发和利用新的方法来询问喷气冷却的瞬态物质。本文将利用直接吸收红外激光方法研究狭缝超音速放电中的喷气冷却自由基、分子离子和分子离子团簇。高灵敏度泛音光谱的簇和反应动力学与对准或定向试剂将研究使用IR-UV-UV三重共振方法。采用新型光学外差/高精细度腔法结合狭缝放电源，研究了射流冷却化学瞬态的超灵敏可见吸收光谱。这个研究项目的重点是在极端能量条件下产生的短寿命分子和离子，因此它们通常不会以稳定的形式在自然界中被发现。这些研究除了具有基础意义外，对解决燃烧和大气化学以及天体物理化学中的问题也具有实际意义。