Spectroscopic Investigations of Reactive Chemical Intermediates

反应性化学中间体的光谱研究

• 批准号: 9974404
• 负责人: Terry Miller
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-15 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9974404&HistoricalAwards=false
• 关键词: Spectroscopic; Investigations; Reactive; Chemical; Intermediates

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Terry Miller of Ohio State University will use cavity ringdown spectroscopy (CRDS) and other techniques to investigate and characterize reactive chemical intermediates. Radical intermediates will be cooled using molecular-beam jets, and electronic transitions will be probed in the visible and infrared spectral regions. Calculations will be used to help analyze spectra, which then become a standard against which computational methods can be compared. Specific species to be examined include weakly bound clusters such as Ne2OH and Ne2SH, metal monomethyl radicals and larger alkyl derivatives, highly unsaturated carbon chain molecules, aryl carbenes, phenyl, and phenoxy radicals, alkyl peroxy radicals, and halogen dioxides.Complex chemical reactions that occur in atmospheric, combustion, and organic synthesis processes typically involve transient chemical intermediates, such as free radicals and molecular ions, that determine the overall result of the process. Spectroscopic identification of the intermediates is critical for the practical investigation and monitoring of such reactions. Spectroscopic characterization of the intermediates provides a foundation for the basic understanding of the nature of chemical reactivity. This research involves a multifaceted approach to the spectroscopic detection and characterization of these intermediates and species involving them. Such intermediates play critical roles in a variety of chemical reactions that are important in understanding such diverse phenomena as ozone depletion, lower-atmospheric air pollution, combustion, and astrochemistry.

在该项目的支持下，在化学部实验性化学计划的支持下，俄亥俄州立大学的特里·米勒（Terry Miller）将使用腔度环光学光谱（CRD）和其他技术来调查和表征反应性化学中间体。 自由基中间体将使用分子梁喷气机冷却，并将在可见的和红外光谱区域探测电子跃迁。 计算将用于帮助分析光谱，然后成为可以比较计算方法的标准。 要检查的特定物种包括弱结合的簇，例如NE2OH和NE2SH，金属单甲基自由基和较大的烷基衍生物，高度不饱和的碳链分子，芳烃，苯基和苯氧根自由基，烷基过氧自由基和卤素doxides.com.com.com.com.com.com.com.com.com.com.com.com.com.com。发生在大气，燃烧和有机合成过程中，通常涉及瞬时化学中间体，例如自由基和分子离子，这些中间体决定了该过程的总体结果。 中间体的光谱鉴定对于对此类反应的实际研究和监测至关重要。 中间体的光谱表征为对化学反应性本质的基本理解奠定了基础。 这项研究涉及对这些中间体和涉及它们物种的光谱检测和表征的多方面方法。 这种中间体在各种化学反应中起着关键作用，这些化学反应对于理解诸如臭氧耗竭，大气下大气污染，燃烧和星体化学等多样性现象很重要。