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000276328 1001_ $$0P:(DE-HGF)0$$aKim, J.$$b0
000276328 245__ $$aAssessing Optical Properties and Refractive Index of Combustion Aerosol Particles Through Combined Experimental and Modeling Studies
000276328 260__ $$aPhiladelphia, Pa$$bTaylor & Francis$$c2015
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000276328 520__ $$aThe variability of optical properties of combustion particles generated from a propane diffusion flame under varying fuel-to-air (C/O) ratios was studied with a three-wavelength nephelometer, a particle soot absorption photometer, and an integrating sphere photometer. Information on particle size distribution, morphology, and elemental carbon to total carbon (EC/TC) ratios were obtained from scanning mobility particle sizer measurements, transmission electron microscopy analyses, and thermal-optical analyses. Particles generated under a low C/O ratio (0.22) showed high elemental carbon fraction (EC/TC = 0.77) and low brown carbon to equivalent black carbon (BrC/EBC) ratio (0.01), and were aggregates composed of small primary particles. Rayleigh–Debye–Gans theory reproduced experimental single-scattering albedo, ω, absorption, and scattering Ångström exponents within 56, 3, and 18%, respectively. In contrast, particles produced under a high C/O ratio (0.60) showed low elemental carbon fraction (EC/TC = 0.09) and high BrC/EBC ratio >100, and were smaller and spherical in shape. Their optical properties were better modeled with Mie theory. By minimizing the difference between calculated and measured ω and Ångström exponents, refractive indices of OC at three visible wavelengths were deduced. Contrary to the widely accepted assumption that refractive index of BC is wavelength independent, BC-rich particles exhibited absorption Ångström exponent >1.0 which implies some degree of wavelength dependence.
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000276328 7001_ $$0P:(DE-HGF)0$$aBauer, H.$$b1
000276328 7001_ $$0P:(DE-HGF)0$$aDobovičnik, T.$$b2
000276328 7001_ $$0P:(DE-HGF)0$$aHitzenberger, R.$$b3
000276328 7001_ $$0P:(DE-HGF)0$$aLottin, D.$$b4
000276328 7001_ $$0P:(DE-HGF)0$$aFerry, D.$$b5
000276328 7001_ $$0P:(DE-Juel1)136669$$aPetzold, A.$$b6$$eCorresponding author$$ufzj
000276328 773__ $$0PERI:(DE-600)2023330-9$$a10.1080/02786826.2015.1020996$$gVol. 49, no. 5, p. 340 - 350$$n5$$p340 - 350$$tAerosol science and technology$$v49$$x1521-7388$$y2015
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