Abstract
To study the extinction of a real small particle system in the infrared, water ice fog has been produced by blowing air through a pipe system which was held at liquid nitrogen temperature. The fog extinction between 2.5 and 15 µm wavelength was determined and compared with ice grain spectra calculated by Mie– theory. It was found that Mie–theory could reproduce the infrared extinction data provided the optical constants of partially amorphous water ice and grain radii of about 0.3 µm were used. Extinction measurements in the near UV confirmed the 0.3 µm grain radii deduced from the IR data. Mie–theory therefore seems to yield meaningful results when applied to sub–micron sized water– ice particles.
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References
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Bohren, C.F., Huffman, D.R., 1983: Absorption and scattering of light by small particles. John Wiley and Sons Inc.
Bergren, M.S., Schuh, D., Sceats, M.G., Rice, S.A., 1978: The OH stretching region infrared spectra of low density amorphous solid water and polycrystalline ice Ih. J.Chem.Phys. 69, pp. 3477–3482.
Bertie, J.E., Labbe, H.J., Whalley, E., 1969: Absorptivity of ice I in the range 4000–30 cm-1. J.Chem.Phys. 50, pp. 4501.
Lèger, A., Gauthier, S., Defourneau, D., Rouan, D., 1983: Properties of amorphous H2O ice and origin of the 3.1 µm absorption. Astron.Astrophys. 117, pp. 164–169.
Kitta, K,, Kratschmer, W., 1983: Status of laboratory experiments on ice mixtures and on the 12 µm H2O ice feature. Astron.Astrophys. 122, pp. 105–110.
Yamamoto, T., Hasegawa, H., 1977: Grain formation through nucleation process in astrophysical environment. Prog. Theor.Phys. 58, pp. 816.
Hagen, W., Tielens, A.G.G.M., Greenberg, J.M., 1981: The infrared spectra of amorphous solid water and ice Ic between 10 and 140 K. Chemical Physics 56, pp. 367.
Huffman, D.R., 1984: private communication.
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© 1985 D. Reidel Publishing Company
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Krätschmer, W., Sorg, N. (1985). Measurement of the Extinction of Water Ice Particles. In: Klinger, J., Benest, D., Dollfus, A., Smoluchowski, R. (eds) Ices in the Solar System. NATO ASI Series, vol 156. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5418-2_10
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DOI: https://doi.org/10.1007/978-94-009-5418-2_10
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