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A detailed investigation of proposed gas-phase syntheses of ammonia in dense interstellar cloudsThe 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.
Document ID
19880026623
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Herbst, Eric
(Duke University Durham, NC, United States)
Defrees, D. J.
(Molecular Research Institute Palo Alto, CA, United States)
Mclean, A. D.
(IBM Almaden Research Center San Jose, CA, United States)
Date Acquired
August 13, 2013
Publication Date
October 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 321
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A13850
Funding Number(s)
CONTRACT_GRANT: NAG2-16
CONTRACT_GRANT: NSF AST-85-13151
Distribution Limits
Public
Copyright
Other

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