Der Einflu\ unipolarer elektrischer Ladungen auf die Beweglichkeit von natürlichem Aerosol

Abstract

The size distribution of natural occuring aerosol particles with radii from 10⁻⁶ to 10⁻⁵ cm was measured by investigation of the distribution of thoron decay products on the mobility spectrum. In addition we used an artifical ionization of the particles traversing a corona discharge. Thus the efficiency of the mobility spectrometer could be increased by a factor of four (as a function of corona current). The electrical charge distribution on the particles having passed the corona is out of equilibrium. Therefore the mobility spectrum can be reduced to a size spectrum only by means of an experimentally determined calibration function.