Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...667.1283e&link_type=abstract
The Astrophysical Journal, Volume 667, Issue 2, pp. 1283-1289.
Astronomy and Astrophysics
Astronomy
24
Astrochemistry, Ism: Atoms, Ism: Clouds, Ism: Molecules, Methods: Laboratory
Scientific paper
The molecular ions HC-6 and HC-4 have recently been identified both in the laboratory and in astronomical environments. In addition, carbon chain anions have been proposed as potential carriers of the diffuse interstellar bands. Using a selected ion flow tube apparatus, we have determined the rate constants for the reactions of C-n and HC-n with H, N, and O atoms in order to characterize their interstellar chemistry. Reactions between the carbon chain anions and H and O occur readily, with rate constants ranging from mid to high 10-10 cm3 s -1. H atom reactions proceed primarily by associative detachment, and O atom reactions proceed both by associative detachment and by extrusion of CO. Reactions between the carbon chains and N atoms are slower, but the reaction products that are observed could provide a negative ion pathway for the synthesis of observed interstellar species.
Barckholtz Cynthia
Bierbaum Veronica M.
Eichelberger Brian
Snow Theodore P.
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