Optika Atmosfery i Okeana Journal

Vol. 18, issue 05-06, article # 6

Dubtsov S. N., Dultsev E. N., Skubnevskaya G. I., Levykin A. I., Sabel'feld K. K. Investigation into the aerosol formation due to SO₂-H₂O-air photolysis at a reduced pressure . // Atmospheric and oceanic optics. 2005. V. 18. No. 05-06. P. 363-366. PDF
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Abstract:

The kinetics of nanoparticle formation due to SO₂ photolysis in air at a reduced pressure (100-400 Torr) has been investigated. The dependence of the aerosol formation rate and of the particle growth rate on SO₂ and water concentration, as well as on the total pressure, has been studied. The particle growth rate was found to be a linear function of the H₂SO₄ concentration and the SO₂ photolysis rate. This rate was a non-linear function of the water concentration, and at H₂O concentration in excess of 10¹⁷ cm^-3, the growth rate saturates. The numerical simulation within a simplified Smoluchowski model of the gas kinetics has been performed. In this model, the particle formation and growth are considered to result from sulfuric acid condensation. Evaporation of clusters is neglected. The model also accounts for the cluster diffusion losses on the surface of the reactor and pipelines. The calculated results are in a good qualitative agreement with the experimental data obtained.