Abstract
A new spectroscopic technique has been developed for the study of chemical reactions between a reactive gas and an aerosol. A single microdroplet of 1-octadecene was suspended by means of electrical fields in a laser beam and the chemical reaction between bromine vapor and the droplet was monitored by recording the optical resonance spectrum of the scattered light and its phase function. Resonances are extremely sensitive to droplet size and refractive index, and hence they were used to determine the refractive index change that occurred as the reaction proceeded. Reaction rates and the solubility of the reactive vapor are shown to be measurable by this method.
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