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Issue 7, 2016
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Ultraviolet broadband light scattering for optically-trapped submicron-sized aerosol particles

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Abstract

We describe a broadband light scattering setup for the characterization of size and refractive index of single submicron-to-micron sized aerosol particles. Individual particles are isolated in air by a quadruple Bessel beam optical trap or a counter-propagating optical tweezer. The use of very broadband radiation in the wavelength range from 320 to 700 nm covering the ultraviolet region allows to size submicron particles. We show that a broad wavelength range is required to determine the particle radius and the refractive index with an uncertainty of several nanometers and ∼0.01, respectively. The smallest particle radius that can be accurately determined lies around 300 nm. Wavelength-dependent refractive index data over a broad range are obtained, including the ultraviolet region where corresponding data are rare. Four different applications are discussed: (1) the sizing of submicron polystyrene latex spheres, (2) the evaporation of binary glycerol water droplets, (3) hydration/dehydration cycling of aqueous potassium carbonate droplets, and (4) photochemical reactions of oleic acid droplets.

Graphical abstract: Ultraviolet broadband light scattering for optically-trapped submicron-sized aerosol particles

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Publication details

The article was received on 12 Nov 2015, accepted on 14 Jan 2016 and first published on 15 Jan 2016


Article type: Paper
DOI: 10.1039/C5CP06940H
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Citation: Phys. Chem. Chem. Phys., 2016,18, 5477-5485

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    Ultraviolet broadband light scattering for optically-trapped submicron-sized aerosol particles

    G. David, K. Esat, I. Ritsch and R. Signorell, Phys. Chem. Chem. Phys., 2016, 18, 5477
    DOI: 10.1039/C5CP06940H

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