Abstract
Macroscopically realizable charging conditions are discussed. The equations for time-dependent unipolar polydisperse aerosol charging by polydisperse ions are first solved for the cases of a constant ionic generation rate of 10 ions/cm 3/sec with ionic removal by diffusion from the charging volume of 1 cm 3 by aerosol capture. In the second case, the equations are used in the modelling of the charging and mobility spectrum analysis of the electrical aerosol analyzer (Thermo Systems, Inc., St. Paul, Minn.) as an example of the “diffusion charging mobility analysis” procedure for aerosol size distribution analysis. Due to ion polydispersity, it is shown for the instrument's lower channels that an ambiguity of at least 50% in the raw data exists for the measurement of free-molecular and transition regime particles by this procedure.
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