Ultraviolet broadband light scattering for optically-trapped submicron-sized aerosol particles. Issue 7 (1st February 2016)

• Record Type: Journal Article
• Authors: David, Grégory; Esat, Kıvanç; Ritsch, Irina; Signorell, Ruth
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 7(2016)
• Page Start: 5477
• Page End: 5485
• Publication Date: 2016-02-01
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c5cp06940h
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A broadband light scattering experiment for the characterization of size and refractive index of single submicron-to-micron sized aerosol particles is presented. 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.