Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ioch.rept..127a&link_type=abstract
In NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains p 127-128 (SEE N89-13330 04-
Astronomy and Astrophysics
Astronomy
Chemical Composition, Cometary Atmospheres, Cosmic Dust, Infrared Spectra, Interstellar Chemistry, Ice, Infrared Sources (Astronomy), Molecular Clouds, Molecular Excitation, Spectrum Analysis
Scientific paper
During the past 15 years considerable progress in observational techniques has been achieved in the middle infrared, the spectral region most diagnostic of molecular vibrations. Spectra of many different astronomical infrared sources are now available. By comparing these astronomical spectra with the spectra of lab ices, one can determine the composition and abundance of the icy materials frozen on the cold dust grains present in the interior of molecular clouds. In the experiments described, the assumption is made that cometary ices are similar to interstellar ices. As an illustration of the processes which can take place as an ice is irradiated and subsequently warmed, the infrared spectra is presented of the mixture H2O:CH3OH:CO:NH3:C6H14 (100:50:10:10:10). Apart from the last species, the ratio of these compounds is representative of the simplest ices found in interstellar clouds.
Allamandola Louis J.
Sandford Scott A.
Valero Francisco P. J.
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