Abstract
The equations of unipolar aerosol charging are written to include ion polydispersity. It is shown that the frequently used N 0 t parameterization of aerosol charging is not unique but can be replaced by a Ct ( C = conductivity) parameterization which is for slip-flow and continuum regime spherical particles of uniform composition. The equations are simplified for the monodisperse unipolar case and, by choosing polydisperse ion distributions which are representative of realistic atmospheric ions, the sensitivity of aerosol charging to specific ion distributions is illustrated. The role of the particle dielectric constant in aerosol charging is assessed.
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