Evolution of Tropospheric Ions
The purpose of this work is to clarify the agglomeration phenomena around small positive and negative ions of tropospheric air. Evolution of tropospheric ions is not well-known; polluting vapors act upon this evolution, according to chemical reactions which are not well understood.
The apparatus used enables us to measure simultaneously the mobility and the mass of ions created in a mixture of atmospheric air and various polluting vapors, at a pressure up to 40 torrs. The experimental results have shown the importance of portonation in the positive ion formation. The evolution rate constants of negative ions are slower than those of positive ions. Finally a mathematical model has allowed a qualitative approach to the sequence of positive ion-molecule reactions in the lower troposphere.
KeywordsOrganic Vapor Torr Pressure Source Chamber Agglomeration Phenomenon Townsend Discharge
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