On the possible detection of solid O2 and O3 interstellar grains with ISO

Details On the possible detection of solid O2 and O3 interstellar grains with ISO On the possible detection of solid O2 and O3 interstellar grains with ISO

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..465e&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)465-(12)471

Astronomy and Astrophysics

Astronomy

3

Astronomical Models, Cosmic Dust, Ice, Infrared Astronomy, Infrared Spectra, Interstellar Chemistry, Oxygen, Ozone, Deposition, Infrared Space Observatory (Iso), Infrared Spectrometers, Molecular Clouds, Photolysis, Ultraviolet Radiation

Scientific paper

In various models of interstelalr grain chemistry solid O2 formed by accretion as well as by surface reactions on grains. In dense molecular cloud models, at a later stage of the evolution, the O2 molecule may become a substantial grain mantle constituent. Since IR dipole vibrational transitions for the homonuclear diatomic molecule O2 are forbidden, the abundance of this potentially important grain mantle component can not be determined. However, embedded in a dirty ice matrix, the fundamental vibration of O2 at approximately 1550/cm becomes observable at 10 K, due to interactions with surrounding molecules, which break the symmetry of molecular oxygen. This process might be applicable for the dust mantle environment of interstellar grains. We have studied the role of solid O2 and O3 in astrophysically relevant ice mixtures and discuss the possible detection of solid O2 and its major photolysis product O3 in interstellar grains, in dense molecular clouds. Both molecules represent a specific target to be observed by the Infrared Space Observatory (ISO) satellite in the near future.

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