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@ARTICLE{Kim:276328,
author = {Kim, J. and Bauer, H. and Dobovičnik, T. and Hitzenberger,
R. and Lottin, D. and Ferry, D. and Petzold, A.},
title = {{A}ssessing {O}ptical {P}roperties and {R}efractive {I}ndex
of {C}ombustion {A}erosol {P}articles {T}hrough {C}ombined
{E}xperimental and {M}odeling {S}tudies},
journal = {Aerosol science and technology},
volume = {49},
number = {5},
issn = {1521-7388},
address = {Philadelphia, Pa},
publisher = {Taylor $\&$ Francis},
reportid = {FZJ-2015-06788},
pages = {340 - 350},
year = {2015},
abstract = {The 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.},
cin = {IEK-8},
ddc = {530},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {243 - Tropospheric trace substances and their
transformation processes (POF3-243)},
pid = {G:(DE-HGF)POF3-243},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000353165900007},
doi = {10.1080/02786826.2015.1020996},
url = {https://juser.fz-juelich.de/record/276328},
}