Abstract

The volume averaged cross sections for extinction, scattering, absorption, and radiation pressure along with the elements of the phase matrix were computed for a spherical polydispersion of water coated carbon particles. The wavelength used was 4910 Å. Two cases were considered. For one we held the thickness of the water coating constant over the polydispersion, while the parameter q = r0/r, (the ratio of core radius to total radius) was varied. For the subsequent case we held q constant over the polydispersion, while the thickness of the coating varied. The results show that there are large differences in both the intensity and degree of polarization between dry and wet aerosols. Also interference phenomena can occur, which demonstrate that the assignment of an average refractive index to aerosols can be misleading and can lead to erroneous results.

© 1976 Optical Society of America

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References

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  1. D. Sinclair, R. J. Countess, A. S. Hooper, Atmos. Environ. 8, 1111 (1974).
    [CrossRef] [PubMed]
  2. P. Winkler, Proceedings of the 7th International Conference on Condensation and Ice Nuclei (Prague and Vienna, 1969), Supplementary Volume, p. 168.
  3. P. Winkler, J. Aerosol Sci. 4, 373 (1973).
    [CrossRef]
  4. A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
    [CrossRef]
  5. M. Kerker, The Scattering of Light and Other Electromagnetic Radiation (Academic Press, New York, 1969).
  6. R. Fenn, H. Oser, Appl. Opt. 4, 1504 (1965).
    [CrossRef]
  7. D. Deirmendjian, Electromagnetic Scattering on Spherical Polydispersions (Elsevier; New York, 1969).

1974 (1)

D. Sinclair, R. J. Countess, A. S. Hooper, Atmos. Environ. 8, 1111 (1974).
[CrossRef] [PubMed]

1973 (1)

P. Winkler, J. Aerosol Sci. 4, 373 (1973).
[CrossRef]

1965 (1)

1951 (1)

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

Aden, A. L.

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

Countess, R. J.

D. Sinclair, R. J. Countess, A. S. Hooper, Atmos. Environ. 8, 1111 (1974).
[CrossRef] [PubMed]

Deirmendjian, D.

D. Deirmendjian, Electromagnetic Scattering on Spherical Polydispersions (Elsevier; New York, 1969).

Fenn, R.

Hooper, A. S.

D. Sinclair, R. J. Countess, A. S. Hooper, Atmos. Environ. 8, 1111 (1974).
[CrossRef] [PubMed]

Kerker, M.

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

M. Kerker, The Scattering of Light and Other Electromagnetic Radiation (Academic Press, New York, 1969).

Oser, H.

Sinclair, D.

D. Sinclair, R. J. Countess, A. S. Hooper, Atmos. Environ. 8, 1111 (1974).
[CrossRef] [PubMed]

Winkler, P.

P. Winkler, J. Aerosol Sci. 4, 373 (1973).
[CrossRef]

P. Winkler, Proceedings of the 7th International Conference on Condensation and Ice Nuclei (Prague and Vienna, 1969), Supplementary Volume, p. 168.

Appl. Opt. (1)

Atmos. Environ. (1)

D. Sinclair, R. J. Countess, A. S. Hooper, Atmos. Environ. 8, 1111 (1974).
[CrossRef] [PubMed]

J. Aerosol Sci. (1)

P. Winkler, J. Aerosol Sci. 4, 373 (1973).
[CrossRef]

J. Appl. Phys. (1)

A. L. Aden, M. Kerker, J. Appl. Phys. 22, 1242 (1951).
[CrossRef]

Other (3)

M. Kerker, The Scattering of Light and Other Electromagnetic Radiation (Academic Press, New York, 1969).

D. Deirmendjian, Electromagnetic Scattering on Spherical Polydispersions (Elsevier; New York, 1969).

P. Winkler, Proceedings of the 7th International Conference on Condensation and Ice Nuclei (Prague and Vienna, 1969), Supplementary Volume, p. 168.

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Figures (8)

Fig. 1
Fig. 1

Volume averaged cross sections vs q for the constant q model.

Fig. 2
Fig. 2

Volume averaged cross sections vs thickness t(μm) for the constant thickness model.

Fig. 3
Fig. 3

Scattering function (P1 + P2)/8π vs scattering angle for the constant thickness model.

Fig. 4
Fig. 4

Degree of polarization [(P1P2)/(P1 + P2)] in percent vs scattering angle for the constant thickness model.

Fig. 5
Fig. 5

P3/4π vs scattering angle for the constant thickness model. The regions where P3 are positive and negative are denoted by + and −, respectively, on the graph.

Fig. 6
Fig. 6

Same as Fig. 3, but for constant q model.

Fig. 7
Fig. 7

Same as Fig. 4, but for constant q model.

Fig. 8
Fig. 8

Same as Fig. 5, but for constant q model.

Equations (2)

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n ( r ) r 6 exp ( - 6 r ) ,
q = 1 - t / r ,

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