Abstract

Angularly resolved elastic light scattering patterns from individual aerosolized Bacillus subtilis spores were qualitatively compared with simulations. Two-dimensional angular optical scattering patterns of the spores were collected for polar scattering angles varying from approximately 77° to 130° and azimuthal angles varying from 0° to 360°. Computations were performed with single T-matrix formalism by simulating a spore with three different particle shapes: (1) a finite-length cylinder with spherical end caps, (2) a spheroid, and (3) two spheres in contact. Excellent agreement between computation and measurement was found for the finite-length cylinder with spherical end caps, poorer agreement was found for the spheroids, and the poorest agreement was for the two spheres in contact.

© 2007 Optical Society of America

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References

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2007 (1)

D. Petrov, G. Videen, Y. Shkuratov, and M. Kaydash, J. Quant. Spectrosc. Radiat. Transf. 108, 81 (2007).
[CrossRef]

2006 (4)

2003 (2)

1997 (1)

1996 (1)

E. Hirst and P. H. Kaye, J. Geophys. Res. 101, 19231 (1996).
[CrossRef]

1991 (1)

1988 (1)

1973 (1)

F. T. Gucker, J. Tuma, H.-M. Lin, C.-M. Huang, S. C. Ems, and T. R. Marshall, J. Aerosol Sci. 4, 389 (1973).
[CrossRef]

Appl. Opt. (2)

J. Aerosol Sci. (1)

F. T. Gucker, J. Tuma, H.-M. Lin, C.-M. Huang, S. C. Ems, and T. R. Marshall, J. Aerosol Sci. 4, 389 (1973).
[CrossRef]

J. Geophys. Res. (2)

E. Hirst and P. H. Kaye, J. Geophys. Res. 101, 19231 (1996).
[CrossRef]

K. B. Aptowicz, R. G. Pinnick, S. C. Hill, Y. L. Pan, and R. K. Chang, J. Geophys. Res. 111, D12212 (2006).
[CrossRef]

J. Opt. Soc. Am. A (1)

J. Quant. Spectrosc. Radiat. Transf. (2)

J. C. Auger and B. Stout, J. Quant. Spectrosc. Radiat. Transf. 79-80, 533 (2003).
[CrossRef]

D. Petrov, G. Videen, Y. Shkuratov, and M. Kaydash, J. Quant. Spectrosc. Radiat. Transf. 108, 81 (2007).
[CrossRef]

Opt. Express (2)

Opt. Lett. (2)

Other (1)

M. I. Mishchenko, L. D. Travis, and A. A. Lacis, Scattering, Absorption and Emission of Light by Small Particles (Cambridge U. Press, 2002).

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Figures (4)

Fig. 1
Fig. 1

Experimental TAOS patterns collected for different BG spores.

Fig. 2
Fig. 2

Selected geometries to model the shape of the BG spores: (a) finite cylinder covered by two hemispheres, (b) prolate spheroid, and (c) two spheres in contact.

Fig. 3
Fig. 3

Theoretical replicates of the TAOS patterns shown in Fig. 1. The spore is modeled as shown in Fig. 2a with (a) X = 0.325 μ m , β = 90 ° , α = 60 ° ; (b) X = 0.316 μ m , β = 90 ° , α = 10 ° ; (c) X = 0.325 μ m , β = 90 ° , α = 10 ° ; and (d) X = 0.316 μ m , β = 70 ° , α = 0 ° .

Fig. 4
Fig. 4

(a) and (b) Replicates of Figs. 1c, 1d, respectively, modeling the spore shape as a prolate spheroid. (c) and (d) Replicates Figs. 1c, 1d, respectively but modeling the spore shape as two spheres in contact.

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