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The C(3P) + NH3 reaction in interstellar chemistry. I. Investigation of the product formation channels

Journal Article · · The Astrophysical Journal (Online)
 [1];  [1];  [2];  [3];  [4];  [4];  [5];  [2];  [1]
  1. UMR, CNRS 6251, Univ. de Rennes, Rennes Cedex (France)
  2. West Virginia Univ., Morgantown, WV (United States)
  3. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  4. Univ. de Bordeaux, Talence (France); CNRS, Institut des Sciences Moleculaires, Talence (France)
  5. Univ. Bordeaux, Floirac (France); CNRS, LAB, UMR, Floirac (France)
+ Show Author Affiliations
The product formation channels of ground state carbon atoms, C(3P), reacting with ammonia, NH3, 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 + NH3 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 + H2CN production channel represents 100% of the product yield for this reaction. As a result, 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.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1329618
Alternate ID(s):
OSTI ID: 22518794
Report Number(s):
SAND--2016-10072J; 648108
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 812; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Rate constants for the N( 2 D) + C 2 H 2 reaction over the 50–296 K temperature range journal January 2019
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