Detection of Triply Deuterated Ammonia in the Barnard 1 Cloud

Details Detection of Triply Deuterated Ammonia in the Barnard 1 Cloud Detection of Triply Deuterated Ammonia in the Barnard 1 Cloud

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...571l..55l&link_type=abstract

The Astrophysical Journal, Volume 571, Issue 1, pp. L55-L58.

Astronomy and Astrophysics

Astronomy

75

Ism: Abundances, Ism: Individual: Name: Barnard 1, Ism: Molecules

Scientific paper

We report the detection of the ground-state rotational transition JK=10-->00 (0a-->0s) of triply deuterated ammonia at 309.91 GHz in the Barnard 1 cloud, obtained with the Caltech Submillimeter Observatory. The observed, integrated, line intensity of 0.307+/-0.019 K km s-1 implies an ND3 column density of (2+/-0.9)×1012 cm-2, for excitation temperatures in the range 5-10 K. Using previously published H2 and NH3 column density estimates in this source, we derive an ND3 fractional abundance with respect to H2 of (1.5+/-1)×10-11 and an ND3-to-NH3 abundance ratio of ~8×10-4. The observed abundance ratios can be explained in the framework of gas-phase chemical models, in which the dissociative recombination of partially deuterated ions results in a somewhat higher probability for the ejection of hydrogen atoms than deuterium.

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