Technical Note: The heterogeneous Zeldovich factor H. Vehkamäki, A. Määttänen, A. Lauri, I. Napari, and M. Kulmala Department of Physical Sciences, Division of Atmospheric Sciences, University of Helsinki, Helsinki, Finland
Abstract. In this technical note we present the exact form of the Zeldovich factor for
heterogeneous nucleation on spherical pre-existing particles. We study the
error caused by planar pre-existing surface approximations, which have been
used in our earlier heterogeneous nucleation model and elsewhere in the
literature. We also test the significance of widely used approximations
for cluster surface area and circumference. We conclude that the approximations
do not affect the predicted onset saturation. Especially for small
pre-existing particles the nucleation rates calculated with the exact and
approximative models differ significantly.
Citation: Vehkamäki, H., Määttänen, A., Lauri, A., Napari, I., and Kulmala, M.: Technical Note: The heterogeneous Zeldovich factor, Atmos. Chem. Phys., 7, 309-313, doi:10.5194/acp-7-309-2007, 2007.