caa a22 4500 445369167 CHVBK 20180317142940.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00340-011-4448-9 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4448-9 Spectrally resolved light absorption properties of cooled soot fromamethane flame [Elektronische Daten] [A. Coderre, K. Thomson, D. Snelling, M. Johnson] The optical properties of combustion-generated soot, crucial information for quantitative soot emission diagnostics and for climate modeling, have been determined for the particular case of cooled soot from a methane flame. Optical extinction measurements were performed over a wavelength range of 450-750nm using a novel diffuse-light, spectrally resolved line-of-sight attenuation experiment, and quantified using extractive methods coupled with scanning and transmission electron microscopy in conjunction with a detailed uncertainty analysis. The absorption component of the total measured extinction was isolated by calculating the expected scattering contribution, according to the Rayleigh-Debye-Gans approximation for polydisperse fractal aggregates. In contrast to the large degree of scatter seen in data previously reported in the literature, aconsistent trend of negligible variation of the soot absorption refractive index function E(m) with wavelength over the visible was observed (E(m)=0.35±0.03 at wavelengths of 450-750nm). These new data are also cast in the form of dimensionless extinction, which is independent of the scatter correction, as well as mass absorption cross section, which is independent of the mass density of soot and is commonly used by atmospheric modelers. Her Majesty the Queen in Right of Canada, 2011 Coderre A. Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, K1S 5B6, Ottawa, Ontario, Canada aut Thomson K. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, K1A 0R6, Ottawa, Ontario, Canada aut Snelling D. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, K1A 0R6, Ottawa, Ontario, Canada aut Johnson M. Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, K1S 5B6, Ottawa, Ontario, Canada aut Applied Physics B Springer-Verlag 104/1(2011-07-01), 175-188 0946-2171 104:1<175 2011 104 340 https://doi.org/10.1007/s00340-011-4448-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4448-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Coderre A. Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, K1S 5B6, Ottawa, Ontario, Canada aut NATIONALLICENCE 700 1- Thomson K. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, K1A 0R6, Ottawa, Ontario, Canada aut NATIONALLICENCE 700 1- Snelling D. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, K1A 0R6, Ottawa, Ontario, Canada aut NATIONALLICENCE 700 1- Johnson M. Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, K1S 5B6, Ottawa, Ontario, Canada aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/1(2011-07-01), 175-188 0946-2171 104:1<175 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer