Formation and properties of neutral ultrafine particles and small ions conditioned by gaseous impurities of the air

Abstract This paper reports new experiments which furnish an explanation of the formation of particles deriving from the photolysis of the gaseous impurities of the air through the oxidation of SO2 demonstrating the nature of the role of NO2 in the process. A new series of results concerning the spectra of mobility of ions formed in air by α-particle disintegrations are presented. On the basis of the combined observations, a tentative explanation permitting the interpretation of the origin of each of the categories of particles is proposed.

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