Abstract
A new method of suspending a single charged aerosol particle is developed and employed to measure particle parameters including mass, electric charge, composition, radius, molecular kinetic theory effects, etc. The method involves a “Millikan oil drop” phenomenon coupled with an elevation dependent gradient of relative humidity and temperature. The Millikan “balance condition” is stabilized by a “restoring force” based on growth and evaporation. Many specialized experimental problems had to be solved before useful operation of the method could be achieved. These solutions are described in the paper. Application of the method includes studies of the interaction of aerosol particles with a cloud, and bubble bursting mechanisms. Additional phenomena such as aerosol particle discharge mechanisms, diffusiophoretic effects, and drop growth mechanisms might be studied by this method but have not yet been attempted.
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