The abundance of nitric oxide in molecular clouds

Details The abundance of nitric oxide in molecular clouds The abundance of nitric oxide in molecular clouds

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..463g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 463-478.

Astronomy and Astrophysics

Astrophysics

14

Abundance, Molecular Clouds, Nitric Oxide, Astronomical Models, Interstellar Chemistry, Molecular Energy Levels

Scientific paper

The detection of two rotational transitions of nitric oxide in six molecular clouds - at two oppositions in the dark cloud L134N and in five giant clouds, OMC1, W51, SgrB2, SgrA + 20 km/s and +50 km/s clouds - is reported. In the dark cloud L134N, the NO column density is about equal to that of (C-18)O, resulting in abundance relative to H2 of about 2 x 10 exp -7. This contrasts with the case of TMC1, where nitric oxide is less abundant than (C-18)O by at least a factor of two. Nitric oxide is mainly produced in the reaction N+OH yields NO+H and mainly destroyed by N+NO yields N2+O. A quantum chemical study of the first reaction indicates that it proceeds with no activation barrier. Steady state chemical models reproduce satisfactorily the observed abundances of NO, and of nitrogen hydrides in the dark cloud L134N, provided that none of the above reactions has an activation barrier.

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