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Observations of strongly deuterated molecules - Implications for interstellar chemistry
Turner, B. E.; Zuckerman, B.
AA(National Radio Astronomy Observatory, Green Bank, W. Va.), AB(Maryland, University, College Park, Md.)
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Oct. 15, 1978, p. L75-L79. Research supported by the John S. Guggenheim Foundation (ApJL Homepage)
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NASA/STI Keywords:
Cosmic Dust, Deuterium Compounds, Galactic Nuclei, Interstellar Chemistry, Abundance, Ionic Reactions, Molecular Interactions, Reaction Kinetics
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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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