Time-resolved Raman spectroscopy from reacting optically levitated microdroplets

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Abstract
Time-resolved Raman spectroscopy is evaluated as a tool for studying reactions in aerosol microdroplets. As a test reaction, the absorption of D2O vapor by an optically levitated glycerol droplet is considered. With the present apparatus, time scales of the order of 1 s have been resolved. By considering the relative amplitude of various features, the composition of the suspended droplet can be estimated as a function of time. In addition, for the D2O–glycerol system the average temperature of the optically levitated droplet can be deduced.