## Effects of Polydispersity of Chainlike Aggregates on Light-Scattering Properties and Data Inversion

Applied Optics, Vol. 41, Issue 4, pp. 723-733 (2002)

http://dx.doi.org/10.1364/AO.41.000723

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### Abstract

A systematic evaluation of the effects of polydispersity of chainlike aggregates in terms of primary particle number density and size on the scattering quantities and data inversion is presented. For aggregates with refractive index in the range |*m*−1| = 0.8–1.2, average size parameter *x* < 0.40, and primary particle number *N*_{p} < 20, it is shown that the effects of polydispersity of primary particle size on the light-scattering quantities are much stronger than the polydispersity of the number of primary particles per aggregate. For aggregates with polydisperse primary particle size, the assumption of monodispersity tends to underestimate the real and imaginary parts of the refractive index and the number of primary particles. Specifically, for values of the distribution width ς greater than 0.10, the effect of polydispersity of the size of primary particles must be considered in the data inversion schemes. Furthermore, in the same range of values for the refractive index, particle size parameter, and primary particle number, the assumption of monodispersity for aggregates with polydisperse particle number tends to underestimate the value of the real part of the refractive index and overestimate the value of the imaginary part of the refractive index and primary particle size. However, for values of the distribution width ς less than 0.60, the effects of polydispersity of primary particle number can be neglected. In addition, the suitable pairing sets of the measured scattering quantities for data inversion are presented and discussed.

© 2002 Optical Society of America

**OCIS Codes**

(010.1100) Atmospheric and oceanic optics : Aerosol detection

(010.1110) Atmospheric and oceanic optics : Aerosols

(010.1120) Atmospheric and oceanic optics : Air pollution monitoring

(010.1310) Atmospheric and oceanic optics : Atmospheric scattering

(290.1090) Scattering : Aerosol and cloud effects

(290.3200) Scattering : Inverse scattering

**Citation**

Tryfon T. Charalampopoulos and Guocai Shu, "Effects of Polydispersity of Chainlike Aggregates on Light-Scattering Properties and Data Inversion," Appl. Opt. **41**, 723-733 (2002)

http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-4-723

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### References

- C. M. Megaridis and R. A. Dobbins, “Morphological description of flame generated materials,” Combust. Sci. Technol. 71, 95–109 (1990).
- R. A. Dobbins and C. M. Megaridis, “Absorption and scattering of light by polydisperse aggregates,” Appl. Opt. 30, 4747–4754 (1991).
- C. M. Sorensen, N. Liu, and J. Cai, “Fractal cluster size distribution measurement using static light scattering,” J. Colloid Interface Sci. 174, 456–460 (1995).
- T. L. Farias, Ü. Ö. Köylü, and M. G. Carvalho, “Effects of polydispersity of aggregates and primary particles on radiative properties of simulated soot,” J. Quant. Spectrosc. Radiat. Transfer 55, 357–371 (1996).
- G. Shu and T. T. Charalampopoulos, “Unified inversion scheme that uses light scattering for morphological parameters and optical properties of aggregated aerosols,” Appl. Opt. 39, 6713–6724 (2000).
- W. Lou and T. T. Charalampopoulos, “On the electromagnetic scattering and absorption of agglomerated small spherical particles,” J. Phys. D 27, 2258–2270 (1994).
- W. Lou and T. T. Charalampopopulos, “On the inverse scattering problem for characterization of agglomerated particulates,” J. Phys. D 28, 2585–2594 (1995).
- Z. Zhang and T. T. Charalampopoulos, “Controlled combustion synthesis of nanosized iron oxide aggregates,” in Twenty-Sixth Symposium (International) on Combustion (Combustion Institute, Pittsburgh, Pa., 1996) pp. 1851–1857.
- D. T. Venizelos, W. Lou, and T. T. Charalampopoulos, “Development of an algorithm for the calculation of the scattering properties of agglomerates,” Appl. Opt. 35, 542–548 (1996).
- G. Shu and T. T. Charalampopoulos, “Reciprocity theorem for the calculation of average scattering properties of agglomerated particles,” Appl. Opt. 39, 5827–5833 (2000).
- M. Kerker, The Scattering of Light and Other Electromagnetic Radiation (Academic, New York, 1969).
- W. H. Press, B. P. Flanney, S. A. Teulosky, and W. T. Vettering, Numerical Recipes, The Art of Scientific Computing (Cambridge U. Press, Cambridge, UK, 1989).
- T. T. Charalampopoulos and H. Chang, “Agglomerate parameters and fractal dimension of soot using light scattering—effects on surface growth,” Combust. Flame 87, 88–99 (1991).
- C. M. Sorensen, J. Cai, and N. Liu, “Light-scattering measurements of monomer size, monomers per aggregate, and fractal dimension for soot aggregates in flames,” Appl. Opt. 31, 6547–6557 (1992).
- B. Vaglieco, O. Monda, F. F. Corcione, and M. P. Mengüc, “Optical and radiative properties of particulates at diesel engine exhaust,” Combust. Sci. Technol. 102, 283–299 (1994).
- M. V. Berry and I. C. Percival, “Optics of fractal clusters such as smokes,” Opt. Acta 33, 577–591 (1986).
- J. Nelson, “Test of a mean field theory for the optics of clusters,” J. Mod. Opt. 36, 1031–1057 (1989).
- H. Y. Chen, M. F. Islander, and J. E. Penner, “Light scattering and absorption by fractal agglomerates and coagulation of smoke aerosols,” J. Mod. Opt. 37, 171–181 (1990).

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