The Reaction of Salt (NaCl) Particles with Nitrate Radical (NO3): A Potential Source of Nighttime Chlorine Compounds

该项目支持硝酸根（NO3）与盐（NaCl）颗粒反应的实验室研究。这项工作的目的是研究夜间氯（Cl2）生产的可能机制。实地研究已经确定，Cl2（也许还有其他光化学不稳定的含氯无机物，如HOCl）在夜间在沿海海域产生，然而，没有任何已知的过程可以解释这一现象。粒子将在与海洋边界层有关的温度、压力和相对湿度条件下被引入气溶胶室。利用FTIR、UV/VIS光谱法和大气压电离光谱法（APIMS）对反应物和产物进行监测。实验结果将使用计算动力学模型进行解释，该模型包括气液两相的实时气体和液体扩散、质量调节和化学，在适当的情况下，还包括界面。

This project supports laboratory studies of the reaction of the nitrate radical (NO3) with salt (NaCl) particles. The objective of this work is to study possible nighttime mechanisms of chlorine (Cl2) production. Field studies have established that Cl2 (and perhaps other photochemically labile chlorine containing inorganics such as HOCl) are generated at night in coastal marine areas, however, none of the known processes can explain this phenomenon. Particles will be introduced into an aerosol chamber under conditions of temperature, pressure, and relative humidity relevant to the marine boundary layer. NO3 will be generated in situ, and the reactants and products monitored by FTIR and UV/VIS spectrometry and atmospheric pressure ionization spectrometry (APIMS). Experimental results will be interpreted using a computational kinetics model that includes gas and liquid diffusion, mass accommodation and chemistry in real time in both the gas and liquid phases, and where appropriate, the interface.