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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 28 — Oct. 1, 2007
  • pp: 6990–7006

Light scattering and absorption by fractal-like carbonaceous chain aggregates: comparison of theories and experiment

Rajan K. Chakrabarty, Hans Moosmüller, W. Patrick Arnott, Mark A. Garro, Jay G. Slowik, Eben S. Cross, Jeong-Ho Han, Paul Davidovits, Timothy B. Onasch, and Douglas R. Worsnop  »View Author Affiliations


Applied Optics, Vol. 46, Issue 28, pp. 6990-7006 (2007)
http://dx.doi.org/10.1364/AO.46.006990


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Abstract

This study compares the optical coefficients of size-selected soot particles measured at a wavelength of 870   nm with those predicted by three theories, namely, Rayleigh–Debye–Gans (RDG) approximation, volume-equivalent Mie theory, and integral equation formulation for scattering (IEFS). Soot particles, produced by a premixed ethene flame, were size-selected using two differential mobility analyzers in series, and their scattering and absorption coefficients were measured with nephelometry and photoacoustic spectroscopy. Scanning electron microscopy and image processing techniques were used for the parameterization of the structural properties of the fractal-like soot aggregates. The aggregate structural parameters were used to evaluate the predictions of the optical coefficients based on the three light-scattering and absorption theories. Our results show that the RDG approximation agrees within 10% with the experimental results and the exact electromagnetic calculations of the IEFS theory. Volume-equivalent Mie theory overpredicts the experimental scattering coefficient by a factor of 3.2 . The optical coefficients predicted by the RDG approximation showed pronounced sensitivity to changes in monomer mean diameter, the count median diameter of the aggregates, and the geometric standard deviation of the aggregate number size distribution.

© 2007 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(290.5850) Scattering : Scattering, particles

ToC Category:
Scattering

History
Original Manuscript: June 4, 2007
Revised Manuscript: August 9, 2007
Manuscript Accepted: August 10, 2007
Published: September 26, 2007

Citation
Rajan K. Chakrabarty, Hans Moosmüller, W. Patrick Arnott, Mark A. Garro, Jay G. Slowik, Eben S. Cross, Jeong-Ho Han, Paul Davidovits, Timothy B. Onasch, and Douglas R. Worsnop, "Light scattering and absorption by fractal-like carbonaceous chain aggregates: comparison of theories and experiment," Appl. Opt. 46, 6990-7006 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-28-6990

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