Aging of Silver Iodide-Sodium Iodide Generator Effluent in Moist and Dry Air

Donald N. Blair Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City

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Briant L. Davis Institute of Atmospheric Sciences, South Dakota School of Mines and Technology, Rapid City

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Abstract

The effect of storage of AgI-NaI aerosol particles in moist and dry air upon the efficiency of nucleation of such particles has been investigated. Samples were obtained from a standard solution generator and tested in an optical cold stage at −15C under a controlled atmosphere. The “wet” and “dry” samples were paired and studied together in the optical cold chamber to eliminate several environmental variables. In 16 out of 21 runs the aerosol aged under dry conditions showed a higher nucleation efficiency, there also being a possible weak positive correlation of the ratio of efficiencies of dry to wet samples with time. Differences between these results and those of other workers can best be explained by differences in aging treatment.

Abstract

The effect of storage of AgI-NaI aerosol particles in moist and dry air upon the efficiency of nucleation of such particles has been investigated. Samples were obtained from a standard solution generator and tested in an optical cold stage at −15C under a controlled atmosphere. The “wet” and “dry” samples were paired and studied together in the optical cold chamber to eliminate several environmental variables. In 16 out of 21 runs the aerosol aged under dry conditions showed a higher nucleation efficiency, there also being a possible weak positive correlation of the ratio of efficiencies of dry to wet samples with time. Differences between these results and those of other workers can best be explained by differences in aging treatment.

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