Observations of strongly deuterated molecules - Implications for interstellar chemistry

Details Observations of strongly deuterated molecules - Implications for interstellar chemistry Observations of strongly deuterated molecules - Implications for interstellar chemistry

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l..75t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Oct. 15, 1978, p. L75-L79. Research supported by the John S. Gu

Other

29

Cosmic Dust, Deuterium Compounds, Galactic Nuclei, Interstellar Chemistry, Abundance, Ionic Reactions, Molecular Interactions, Reaction Kinetics

Scientific paper

The J = 1 - 0 transitions of DCO(+), N2D(+), DCN, and DNC in 13 interstellar clouds has been surveyed. In the dark dust clouds L63 and L134N, the apparent ratio DCO(+)/HCO(+) exceeds unity. While the apparent ratio DNC/HNC is of order unity in these cluds, N2D(+)/N2H(+) is significantly smaller. In other sources outside the galactic center, DCO(+)/HCO(+) and DNC/HNC are typically a few hundredths and somewhat larger than DCN/HCN. None of these deuterated species is detected in the galactic-center region. These results are analyzed in terms of current ion-molecule reaction schemes. Possible differences between DCO(+)/HCO(+) and N2D(+)/N2H(+) are considered and used to place restrictions on physical conditions and abundances in deuterated sources. Predictions are made for NH2D/NH3 and HDO/H2O and compared with recent observations. Ion-molecule chemistry, as at present understood, appears consistent with existing observations of deuterated interstellar molecules.

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