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Reproduction of the Interstellar Ice Band by Grain Mantle Analogs

Published online by Cambridge University Press:  14 August 2015

W. Hagen ,
A.G.G.M. Tielens  and
J. M. Greenberg
W. Hagen
Affiliation:
Laboratory Astrophysics Group, Huygens Laboratory, Wassenaarseweg 78, 2300 RA Leiden, Netherlands.
A.G.G.M. Tielens
Affiliation:
Laboratory Astrophysics Group, Huygens Laboratory, Wassenaarseweg 78, 2300 RA Leiden, Netherlands.
J. M. Greenberg
Affiliation:
Laboratory Astrophysics Group, Huygens Laboratory, Wassenaarseweg 78, 2300 RA Leiden, Netherlands.

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The near-infrared spectrum of many sources associated with molecular clouds shows a broad absorption feature at 3.08 μm (e.g. Merrill et al., 1976; Harris et al., 1978). This feature has usually been attributed to absorption by H2O ice frozen on grains, but it has been impossible to satisfactorily reproduce the observed band shape (Merrill et al., 1976; Mukai et al., 1978). We have been able to obtain a complete fit of this absorption feature in the laboratory using very low temperature mixtures of H2O with other polar molecules. The preparation of these interstellar dust grain-mantle analogs has been described elsewhere (Greenberg, 1979; Hagen et al., 1979). They are prepared by allowing a gas mixture of simple molecules (e.g. CO, H2O, NH3, CH4 etc.) to condense on a low temperature (10 K) substrate. This frozen mixture can be heated and recooled. The samples are analyzed with an infrared spectrometer.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 387 - 388
Copyright
Copyright © Reidel 1980 

References

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