THE C(3P) + NH3 REACTION IN INTERSTELLAR CHEMISTRY. I. INVESTIGATION OF THE PRODUCT FORMATION CHANNELS

被引:39
作者
Bourgalais, Jeremy [1 ]
Capron, Michael [1 ]
Kailasanathan, Ranjith Kumar Abhinavam [2 ]
Osborn, David L. [3 ]
Hickson, Kevin M. [4 ,5 ]
Loison, Jean-Christophe [4 ,5 ]
Wakelam, Valentine [6 ,7 ]
Goulay, Fabien [2 ]
Le Picard, Sebastien D. [1 ]
机构
[1] Univ Rennes 1, UMR CNRS 6251, Inst Phys Rennes, Astrophys Lab, F-35042 Rennes, France
[2] W Virginia Univ, Dept Chem, Morgantown, WV 26506 USA
[3] Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA
[4] Univ Bordeaux, Inst Sci Mol, UMR 5255, F-33400 Talence, France
[5] CNRS, Inst Sci Mol, UMR 5255, F-33400 Talence, France
[6] Univ Bordeaux, LAB, UMR 5804, F-33270 Floirac, France
[7] CNRS, LAB, UMR 5804, F-33270 Floirac, France
关键词
astrochemistry; ISM: atoms; ISM: clouds; ISM: molecules; molecular data; molecular processes; ELECTRONIC-STRUCTURE THEORY; DENSE INTERSTELLAR CLOUDS; NEUTRAL-NEUTRAL REACTIONS; VACUUM ULTRA-VIOLET; RANGE; 24-300; K; ATOMIC CARBON; RATE COEFFICIENTS; RATE-CONSTANT; DARK CLOUDS; AB-INITIO;
D O I
10.1088/0004-637X/812/2/106
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The product formation channels of ground state carbon atoms, C(P-3), 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. 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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页数:12
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