A Study of Chemical Reactions in Levitated Particles

微米大小的颗粒被悬浮在四极捕捉器中，同时暴露在不同水平的大气气体中。四极捕获器允许观察粒子与其气体环境的成分相互作用所引起的粒子质量变化。研究的候选系统将包括硫酸液滴与氨的相互作用，氯化钠溶液吸收硫酸和硝酸蒸气并释放氯化氢，氯化钠溶液暴露在SO2、NO2、O3或H2 O2中生产硫酸或硝酸，暴露在SO2、O3和NH3中的溶液液滴生产硫酸铵，在氯化钠溶液中生产硫酸，在掺杂铁族离子的液滴中暴露在SO2和O2中，在暴露在H2O、O2、SO2和NH3中的硫酸锰颗粒表面产生硫酸铵。悬浮在捕集器中的单个颗粒将暴露在流动的氮气中，其中包含一种或多种反应气体，同时将监测质量和颗粒尺寸的变化(通过光散射)。结果将以净变化率的形式显示。

Particles in the micron-size range are levitated in a quadrupole trap while being exposed to varying levels of atmospheric gases. The quadrupole trap permits the observation of particle mass changes resulting from interaction of a particle with components of its gaseous environment. Candidate systems for study will include sulfuric acid droplets interacting with ammonia, the absorption by sodium chloride solutions of sulfuric acid and nitric acid vapors with release of hydrogen chloride, the production of sulfuric or nitric acid by exposure of sodium chloride solutions to SO2, NO2, O3, or H2 O2, the production of ammonium sulfate in solution droplets exposed to SO2, O3 and NH3, the production of sulfuric acid in sodium chloride solution droplets doped with iron group ions and exposed to SO2 and O2, and the production of ammonium sulfate at the surface of manganese sulfate particles exposed to H2O, O2, SO2 and NH3. Individual particles suspended in the trap will be exposed to flowing N2 containing one or more of the reactant gases while changes in mass and particle size (by light scattering) will be monitored. Results will be presented as rates of net change.