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Title: THE C({sup 3}P) + NH{sub 3} REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH{sub 2}, AND NH{sub 3} ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

Abstract

A continuous supersonic flow reactor has been used to measure rate constants for the C({sup 3}P) + NH{sub 3} reaction over the temperature range 50–296 K. C({sup 3}P) atoms were created by the pulsed laser photolysis of CBr{sub 4}. The kinetics of the title reaction were followed directly by vacuum ultra-violet laser induced fluorescence of C({sup 3}P) loss and through H({sup 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{sup −10} cm{sup 3} molecule{sup −1} s{sup −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{sub 2}, which plays a crucial role in interstellar NH{sub 3} synthesis, is examined.

Authors:
;  [1]; ; ;  [2];  [3];  [4]
  1. Université de Bordeaux, Institut des Sciences Moléculaires, UMR 5255, F-33400 Talence (France)
  2. Institut de Physique de Rennes, Astrophysique de Laboratoire, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex (France)
  3. Department of Chemistry, West Virginia University, Morgantown, WV 26506 (United States)
  4. Université de Bordeaux, Laboratoire d’Astrophysique de Bordeaux, UMR 5804, F-33270 Floirac (France)
Publication Date:
OSTI Identifier:
22518795
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 812; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIA; ATOMS; CARBON; CHEMISTRY; FLUORESCENCE; HYDROGEN; LASER RADIATION; LOSSES; MOLECULES; PHOTOLYSIS; REACTION KINETICS; SUPERSONIC FLOW; SYNTHESIS

Citation Formats

Hickson, Kevin M., Loison, Jean-Christophe, Bourgalais, Jérémy, Capron, Michael, Picard, Sébastien D. Le, Goulay, Fabien, and Wakelam, Valentine, E-mail: kevin.hickson@u-bordeaux.fr. THE C({sup 3}P) + NH{sub 3} REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH{sub 2}, AND NH{sub 3} ABUNDANCES IN DENSE INTERSTELLAR CLOUDS. United States: N. p., 2015. Web. doi:10.1088/0004-637X/812/2/107.
Hickson, Kevin M., Loison, Jean-Christophe, Bourgalais, Jérémy, Capron, Michael, Picard, Sébastien D. Le, Goulay, Fabien, & Wakelam, Valentine, E-mail: kevin.hickson@u-bordeaux.fr. THE C({sup 3}P) + NH{sub 3} REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH{sub 2}, AND NH{sub 3} ABUNDANCES IN DENSE INTERSTELLAR CLOUDS. United States. doi:10.1088/0004-637X/812/2/107.
Hickson, Kevin M., Loison, Jean-Christophe, Bourgalais, Jérémy, Capron, Michael, Picard, Sébastien D. Le, Goulay, Fabien, and Wakelam, Valentine, E-mail: kevin.hickson@u-bordeaux.fr. Tue . "THE C({sup 3}P) + NH{sub 3} REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH{sub 2}, AND NH{sub 3} ABUNDANCES IN DENSE INTERSTELLAR CLOUDS". United States. doi:10.1088/0004-637X/812/2/107.
@article{osti_22518795,
title = {THE C({sup 3}P) + NH{sub 3} REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH{sub 2}, AND NH{sub 3} ABUNDANCES IN DENSE INTERSTELLAR CLOUDS},
author = {Hickson, Kevin M. and Loison, Jean-Christophe and Bourgalais, Jérémy and Capron, Michael and Picard, Sébastien D. Le and Goulay, Fabien and Wakelam, Valentine, E-mail: kevin.hickson@u-bordeaux.fr},
abstractNote = {A continuous supersonic flow reactor has been used to measure rate constants for the C({sup 3}P) + NH{sub 3} reaction over the temperature range 50–296 K. C({sup 3}P) atoms were created by the pulsed laser photolysis of CBr{sub 4}. The kinetics of the title reaction were followed directly by vacuum ultra-violet laser induced fluorescence of C({sup 3}P) loss and through H({sup 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{sup −10} cm{sup 3} molecule{sup −1} s{sup −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{sub 2}, which plays a crucial role in interstellar NH{sub 3} synthesis, is examined.},
doi = {10.1088/0004-637X/812/2/107},
journal = {Astrophysical Journal},
number = 2,
volume = 812,
place = {United States},
year = {Tue Oct 20 00:00:00 EDT 2015},
month = {Tue Oct 20 00:00:00 EDT 2015}
}