论文部分内容阅读
气相自由基能与各种气体发生快速反应,在大气化学、燃烧化学和星际化学等重要的化学过程中起着关键性的催化作用。许多实验方法(例如荧光法和吸收法)已经用于研究气相自由基反应动力学过程,并取得许多重要的成果,但这些技术局限于探测小分子自由基反应。流动管反应器和闪光光解结合光电离质谱的实验技术以其通用性、多重探测性、选择性和灵敏性等多种优势,成为研究气相自由基反应的主要实验方法。本文介绍利用高通量、高分辨、连续可调的同步辐射光电离质谱开展多种自由基反应研究所取得的一些独创性的成果。另外,该技术具有独有的时间分辨、能量分辨和异构体分辨的能力,能够广泛用于大气化学、燃烧化学和星际化学中一些重要的气相自由基(如烷氧自由基、烃类自由基等)反应宏观动力学过程的研究。
Vapor free radicals can react rapidly with various gases and play a key catalytic role in important chemical processes such as atmospheric chemistry, combustion chemistry, and interstellar chemistry. Many experimental methods (such as fluorescence and absorption) have been used to study the kinetics of gas-phase reaction kinetics and many important results have been obtained, but these techniques are limited to the detection of small molecule free radical reactions. The experimental technique of flow tube reactor and flash photolysis combined with photoionization mass spectrometry has become the main experimental method for the study of gas-phase radical reaction with its versatility, multiple detection, selectivity and sensitivity. This article describes some of the original results achieved by using high-throughput, high-resolution, continuously tunable synchrotron radiation photoionization mass spectrometry to study a variety of free radical reactions. In addition, this technique has unique ability of time resolution, energy resolution and isomer resolution, and can be widely used in some important gas phase free radicals in atmospheric chemistry, combustion chemistry and interstellar chemistry (such as alkoxy free radicals, hydrocarbon free Etc.) research macroscopic kinetic process.