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Article Dans Une Revue The Astrophysical Journal Année : 2015

The C(3P) + NH3 Reaction in Interstellar Chemistry. I. Investigation of the Product Formation Channels

Résumé

The product formation channels of ground state carbon atoms, C( 3 P), reacting with ammonia, NH 3 , have been investigated using two complementary experiments and electronic structure calculations. Reaction products are detected in a gas flow tube experiment (330 K, 4 Torr) using tunable vacuum-ultraviolet (VUV) photoionization coupled with time of flight mass spectrometry. Temporal profiles of the species formed and photoionization spectra are used to identify primary products of the C + NH 3 reaction. In addition, H-atom formation is monitored by VUV laser induced fluorescence (LIF) from room temperature to 50 K in a supersonic gas flow generated by the Laval nozzle technique. Electronic structure calculations are performed to derive intermediates, transition states, and complexes formed along the reaction coordinate. The combination of photoionization and LIF experiments supported by theoretical calculations indicate that in the temperature and pressure range investigated, the H + H 2 CN production channel represents 100% of the product yield for this reaction. Kinetics measurements of the title reaction down to 50 K and the effect of the new rate constants on interstellar nitrogen hydride abundances using a model of dense interstellar clouds are reported in Paper II
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Dates et versions

hal-01225629 , version 1 (10-11-2022)

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Jérémy Bourgalais, Michael Capron, Ranjith Kumar Abhinavam Kailasanathan, David L. Osborn, Kevin M. Hickson, et al.. The C(3P) + NH3 Reaction in Interstellar Chemistry. I. Investigation of the Product Formation Channels. The Astrophysical Journal, 2015, 812 (2), pp.106. ⟨10.1088/0004-637X/812/2/106⟩. ⟨hal-01225629⟩
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