Formation of ions in interstellar grain mantles.
Abstract
The presence of ionic species in interstellar grain mantles has been inferred from laboratory studies of photolyzed astrophysical dirty ices involving isotopically labelled compounds. The combination of the experimental data with infrared observations of W33A and other protostellar sources has led to the unambiguous identification of the 4.62 μm band with OCN-. For the 6.86 μm band a new non-carbon carrier is proposed. The observed isotopic shifts rule out a nitrogen-oxygen compound and point to NH4+. Possible formation mechanisms are discussed.
- Publication:
-
Dust in the Universe
- Pub Date:
- 1988
- Bibcode:
- 1988duun.conf..275G
- Keywords:
-
- Cosmic Dust;
- Interstellar Chemistry;
- Interstellar Matter;
- Ions;
- Absorption Spectra;
- Ice;
- Infrared Spectra;
- Photolysis;
- Astrophysics;
- Interstellar Grains: Laboratory Simulations;
- Interstellar Grains: Infrared Spectra;
- Interstellar Grains: Photoionization