A detailed investigation of proposed gas-phase syntheses of ammonia in dense interstellar clouds

Details A detailed investigation of proposed gas-phase syntheses of ammonia in dense interstellar clouds A detailed investigation of proposed gas-phase syntheses of ammonia in dense interstellar clouds

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..898h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 898-906.

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56

Ammonia, Endothermic Reactions, Interstellar Gas, Molecular Clouds, Nitrogen Ions, Vapor Phases, Chemical Reactions, Computational Astrophysics, Computational Chemistry, Exothermic Reactions, Low Temperature, Stellar Evolution

Scientific paper

The initial reactions of the Herbst and Klemperer (1973) and the Dalgarno (1974) schemes (I and II, respectively) for the gas-phase synthesis of ammonia in dense interstellar clouds were investigated. The rate of the slightly endothermic reaction between N(+) and H2 to yield NH(+) and H (scheme I) under interstellar conditions was reinvestigated under thermal and nonthermal conditions based on laboratory data. It was found that the relative importance of this reaction in synthesizing ammonia is determined by how the laboratory data at low temperature are interpreted. On the other hand, the exothermic reaction between N and H3(+) to form NH2(+) + H (scheme II) was calculated to possess significant activation energy and, therefore, to have a negligible rate coefficient under interstellar conditions. Consequently, this reaction cannot take place appreciably in interstellar clouds.

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