Chemical Identification of Tropospheric Ions

这是一个识别和量化自然出现在对流层中的大气离子的项目。它使用串联质谱仪和专门开发的碰撞解离室，从中心核心离子中剥离松散结合的配体分子，从而能够对核心离子本身进行质谱学观察。该装置的运行依赖于在研究的早期阶段开发的用于在大气压下从空气中提取离子并将它们注入质谱仪真空系统的气体流动系统。目的是考察分子离子和电离分子团簇在低层大气中的自然存在。离子的化学性质以及它们的来源、它们在一系列环境条件下的丰度以及它们作为痕量气体指示剂的作用都有待确定。最终，这项工作有望确定离子在气溶胶形成和生长中的可能作用。

This is a project to identify and quantify atmospheric ions naturally occurring in the troposphere. It employs a tandem mass spectrometer in conjunction with a specially developed collisional dissociation chamber that strips loosely bound ligand molecules from the central core ion, thus allowing mass spectrometric observation of the core ion itself. The operation of the apparatus depends on the development, in an earlier stage of the research, of a gas.flow system for extracting the ions from air at atmospheric pressure and injecting them into the vacuum system of the mass spectrometer. The objective is to survey the natural existence in the lower atmosphere of molecular ions and ionized molecular clusters. The chemical nature of the ions is to be determined, as well as their origins, their abundance under a range of environmental conditions, and their roles as indicators of trace gases. Ultimately the work is expected to identify the possible roles of ions in aerosol formation and growth.