Other
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apjs...54...81m&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 54, Jan. 1984, p. 81-101. Research supported by the Natural Scien
Other
66
Abundance, Interstellar Chemistry, Molecular Clouds, Shock Waves, Chemical Composition, Chemical Reactions, Dissociation, Hydrocarbons, Tables (Data)
Scientific paper
Abundances of 113 species have been followed for 100,000 yr after passage of a shock through an interstellar cloud of initial density 10,000/cu cm. Calculations were performed for shock speeds from 5 to 20 km/s. It is found that the shock becomes dissociative for a speed of about 17 km/s, and that molecules of CO, N2, and CO2 are little affected by shocks ranging from 5 to 15 km/s. For shocks of 7-16 km/s, much of the available atomic C, N, and O is incorporated into molecules as a result of post-shock chemical processing. The molecules H2O, H2CO, CH2, CH3, CH4, NH3, and HCN attain very high postshock abundances over most of the range of shock speeds 5-15 km/s. Other molecules attain high postshock abundances for at least part of this range. Shock synthesis of hydrocarbon molecules with more than three carbon atoms is less effective in a dense than in a diffuse cloud.
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