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5. Ice Grains in Space

Published online by Cambridge University Press:  12 April 2016

R. Smoluchowski

Abstract

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Certain astrophysically interesting properties of ice grains depend upon their crystallinity. Lower temperatures such as those in the outer layers of a dust cloud favor amorphous ice, the center of the cloud may favor crystalline ice. Amorphous grains have different binding energies than crystalline grains resulting in different evaporation rates and affecting the distance from the sun at which dust is released in cometary tails. They have also different sticking and accommodation coefficients which affect the formation of H2 and of other molecules on their surfaces. In contrast to crystalline grains, amorphous grains can be easily ionized by the stellar ultraviolet photons with important consequences for surface reactions, heating, etc.

Type
Part I. Physical Nature of Comets
Information
International Astronomical Union Colloquium , Volume 39: Comets, Asteroids, Meteorites: Interrelations, Evolution and Origins , December 1977 , pp. 47 - 49
Copyright
Copyright © A.H. Delsemme 1977

References

Baron, B., and Williams, F. 1976 J. Chem. Phys., 64, 3896.Google Scholar
Bennett, C. H. 1972 J. Appl. Phys., 43, 2727.CrossRefGoogle Scholar
Briant, C. L., and Burton, J. J. 1975, J. Chem. Phys., 63, 3327.Google Scholar
Field, G. B. 1974, Highlights of Astronomy, 3, 37.Google Scholar
Fletcher, N. H. 1970, The Chemical Physics of Ice, Cambridge, U. Press, Cambridge.Google Scholar
Habing, H. J. 1968, Bull, Astr. Inst. Netherlands, 19, 421.Google Scholar
Hollenbach, D., and Salpeter, E. E. 1970, J. Chem. Phys., 53, 79.CrossRefGoogle Scholar
Hollenbach, D., and Salpeter, E. E. 1971, Ap.J., 163, 155.CrossRefGoogle Scholar
Leung, C. M. 1975, Ap.J., 199, 340.Google Scholar
Sekanina, Z. 1975, Icarus, 25, 218.Google Scholar
Smoluchowski, R. 1977, (in preparation).Google Scholar
Venkatesh, C. G., Rice, S. A., and Narten, A. H. 1974, Science, 186, 927.Google Scholar
Watson, W. D. 1972, Ap.J., 176, 103.Google Scholar