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Titolo:
Rate coefficients for the reactions of Si(P-3(J)) with C2H2 and C2H4: Experimental results down to 15 K
Autore:
Canosa, A; Le Picard, SD; Gougeon, S; Rebrion-Rowe, C; Travers, D; Rowe, BR;
Indirizzi:
Univ Rennes 1, Equipe Astrochim Expt, UMR Phys Atom Lasers Mol & Surfaces 6627, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 urfaces 6627, F-35042 Rennes, France
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 14, volume: 115, anno: 2001,
pagine: 6495 - 6503
SICI:
0021-9606(20011008)115:14<6495:RCFTRO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHEMICAL-VAPOR-DEPOSITION; NEUTRAL-NEUTRAL REACTIONS; CROSSED-BEAM REACTION; RESONANCE-ABSORPTION SPECTROSCOPY; STATE ATOMIC SILICON; ABSOLUTE RATE DATA; HYDROCARBON MOLECULES; INTERSTELLAR CLOUDS; CARBON-ATOMS; CHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
78
Recensione:
Indirizzi per estratti:
Indirizzo: Canosa, A Univ Rennes 1, Equipe Astrochim Expt, UMR Phys Atom Lasers Mol &Surfaces 6627, Campus Beaulieu, F-35042 Rennes, France Univ Rennes 1 Campus Beaulieu Rennes France F-35042 nes, France
Citazione:
A. Canosa et al., "Rate coefficients for the reactions of Si(P-3(J)) with C2H2 and C2H4: Experimental results down to 15 K", J CHEM PHYS, 115(14), 2001, pp. 6495-6503

Abstract

Rate coefficients for the reaction of ground-state silicon atoms Si(P-3(J)) with acetylene and ethylene have been measured at temperatures down to 15K. The experiments have been performed in a continuous flow CRESU (Cinetique de Reaction en Ecoulement Supersonique Uniforme) apparatus using pulsed laser photolysis of Si(CH3)(4) to generate Si(P-3(J)) atoms and laser-induced fluorescence to observe the kinetic decay of the atoms and hence determine the rate coefficients. Both reactions are found to be fast, and the reaction rates show a very mild dependence on temperature. The rate coefficients match the expressions k(Si+C2H2)=(2.6+/-0.6)10(-10) (T/300)-((0.71+/-0.24))exp(-(29 +/-10)/T)cm(3) molecule(-1) s(-1) and k(Si+C2H4)=(3.74+/-0.3)10(-10) (T/300)(-(0.34+/-0.10))exp(-(16 +/-4)/T) cm(3) molecule(-1) s(-1) in the temperature range 15-300 K. The nature of the products and the similarities of the carbon and silicon chemistry are discussed. (C) 2001 American Institute of Physics.

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Documento generato il 27/11/20 alle ore 07:29:07