Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pcim.conf....9a&link_type=abstract
Physics and Composition of Interstellar Matter, Proceedings of a Conference held in Bachotek, Poland, June 4-9, 1990. Edited by
Astronomy and Astrophysics
Astronomy
1
Comets, Dust, Interstellar Matter, Molecular Clouds, Chemical Composition, Hydrocarbons, Infrared Spectra, Interstellar Gas, Solid Phases, Vapor Phases
Scientific paper
During the past 15 years considerable progress in observational techniques has been achieved in the middle-infrared region (5000-500/cm, 2-20 microns), the region where most diagnostic molecular vibrations occur. Spectra of many different astronomical infrared sources, some deeply embedded in dark molecular clouds and others obscured only by dust in the diffuse interstellar medium are now available. These spectra provide a powerful probe, not only for the identification of interstellar molecules in both the gas and solid phases, but also of the physical and chemical conditions which prevail in these two very different domains. By comparing these spectra with laboratory spectra one can determine the composition and abundance of the icy material frozen on the cold (- 10K) dust in the dark interior of molecular clouds and of the hydrocarbon component of dust in the diffuse interstellar medium. As these are the building blocks of comets, the work described here also gives insight into the nature of comets.
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