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The Formation of Hydrocarbons and Iron-Hydrides on Cold Interstellar Grains-Experimental Studies

Published online by Cambridge University Press:  14 August 2015

A. Bar-Nun ,
M. Litman ,
M. Pasternak  and
M. L. Rappaport
A. Bar-Nun
Affiliation:
1 Department of Geophysics and Planetary Sciences
M. Litman
Affiliation:
1 Department of Geophysics and Planetary Sciences
M. Pasternak
Affiliation:
1 Department of Geophysics and Planetary Sciences
M. L. Rappaport
Affiliation:
1 Department of Geophysics and Planetary Sciences

Abstract

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Cold hydrogen atoms at T ≥ 7K were shown experimentally to react with graphite grains at the same temperature to produce CH4 and smaller amounts of C2H6, C2H4 and C2H2. At T < 20K the hydrocarbon mantle could polymerize to form carbonaceous substances, similar to those found in carbonaceous chondrites. Further encounters with H-atoms would result in their recombination on the hydrocarbon mantle around the grains. At higher grain temperatures, the hydrocarbons formed could be ejected into the gas phase.

Cold iron atoms at T < 5K were shown experimentally to react with molecular hydrogen in a T < 5K matrix. Mössbauer studies with 57Fe demonstrated the formation of an Fe-H2 bond. FeH2 and FeH molecules could be formed on grains by encounters of iron atoms with either H-atoms or H2 molecules.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 367 - 371
Copyright
Copyright © Reidel 1980 

References

Barlow, M.J., and Silk, J.: 1976, Ap. J. 207, pp. 131.Google Scholar
Bar-Nun, A.: 1975, Ap. J. 197, pp. 341.Google Scholar
Bar-Nun, A., Litman, M., and Rappaport, M.L.: 1979. Submitted to Astron. & Astrophys.Google Scholar
Knacke, R.F.: 1977, Nature 269, pp. 132.Google Scholar
Pasternak, M., and Barrett, P.H.: 1978. Proceedings of “{Workshop in Applications of Mössbauer Spectroscopy” Seeheim/Bergstrasse, W. Germany, April, 1978.Google Scholar
Walker, J.H., Walker, T.E.H., and Kelly, H.P.: 1972, J. Chem. Phys. 57, pp. 2094.Google Scholar
Watson, W.D., and Salpeter, E.E.: 1972, Ap. J. 174, pp. 321.Google Scholar
Wood, B.J., and Wise, H.: 1969, J. Chem. Phys. 73, pp. 1348.Google Scholar