The C(3P) + NH3 Reaction in Interstellar Chemistry. II. Low Temperature Rate Constants and Modeling of NH, NH2, and NH3 Abundances in Dense Interstellar Clouds

Kevin Hickson Jean-Christophe Loison Jérémy Bourgalais 1 Michael Capron 2 Sébastien D. Le Picard 1 Fabien Goulay 1 Valentine Wakelam 3
3 AMOR 2015
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], UB - Université de Bordeaux, INSU - CNRS - Institut national des sciences de l'Univers , CNRS - Centre National de la Recherche Scientifique
Abstract : A continuous supersonic flow reactor has been used to measure rate constants for the C(3P) + NH3 reaction over the temperature range 50–296 K. C(3P) atoms were created by the pulsed laser photolysis of CBr4. The kinetics of the title reaction were followed directly by vacuum ultra-violet laser induced fluorescence of C(3P) loss and through H(2S) 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 cm3 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 H2, which plays a crucial role in interstellar NH3 synthesis, is examined.
Type de document :
Article dans une revue
Astrophysical Journal, American Astronomical Society, 2015, 812 (2), pp.107. 〈10.1088/0004-637X/812/2/107〉
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Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 20 octobre 2015 - 17:57:52
Dernière modification le : jeudi 23 novembre 2017 - 15:00:02

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Kevin Hickson, Jean-Christophe Loison, Jérémy Bourgalais, Michael Capron, Sébastien D. Le Picard, et al.. The C(3P) + NH3 Reaction in Interstellar Chemistry. II. Low Temperature Rate Constants and Modeling of NH, NH2, and NH3 Abundances in Dense Interstellar Clouds. Astrophysical Journal, American Astronomical Society, 2015, 812 (2), pp.107. 〈10.1088/0004-637X/812/2/107〉. 〈hal-01218214〉

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