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American Astronomical Society, Astrophysical Journal, 2(812), p. 107, 2015

DOI: 10.1088/0004-637x/812/2/107

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The C(3p) + Nh3reaction in Interstellar Chemistry. Ii. Low Temperature Rate Constants and Modeling of Nh, Nh2, and Nh3abundances in Dense Interstellar Clouds

Journal article published in 2015 by Kevin M. Hickson ORCID, Jean-Christophe Loison, Jérémy Bourgalais ORCID, Michael Capron, Sébastien D. Le Picard ORCID, Fabien Goulay, Valentine Wakelam ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A continuous supersonic flow reactor has been used to measure rate constants for the C(3 P) + NH 3 reaction over the temperature range 50–296 K. C(3 P) atoms were created by the pulsed laser photolysis of CBr 4. The kinetics of the title reaction were followed directly by vacuum ultraviolet laser induced fluorescence of C(3 P) loss and through H(2 S) formation. The experiments show unambiguously that the reaction is rapid at 296 K, becoming faster at lower temperatures, reaching a value of (1.8 ± 0.2) × 10 −10 cm 3 molecule −1 s −1 at 50 K. As this reaction is not currently included in astrochemical networks, its influence on interstellar nitrogen hydride abundances is tested through a dense cloud model including gas–grain interactions. In particular, the effect of the ortho-to-para ratio of H 2 , which plays a crucial role in interstellar NH 3 synthesis, is examined.