Low temperature rate coefficients for reactions of the butadiynyl radical, C4H, with various hydrocarbons. Part II: reactions with alkenes (ethylene, propene, 1-butene), dienes (allene, 1,3-butadiene) and alkynes (acetylene, propyne and 1-butyne)

被引：38

作者：

Berteloite, Coralie ^{[1
]}

Le Picard, Sebastien D. ^{[1
]}

Balucani, Nadia ^{[1
]}

Canosa, Andre ^{[1
]}

Sims, Ian R. ^{[1
]}

机构：

[1] Univ Rennes 1, CNRS, UMR 6251, Inst Phys Rennes,Equipe Astrochim Expt, F-35042 Rennes, France

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 15期

基金：

美国国家科学基金会;

关键词：

NEUTRAL-NEUTRAL REACTIONS; CROSSED-BEAM REACTION; LAVAL NOZZLE APPARATUS; RANGE; 24-300; K; CN(X (2)SIGMA(+)); C2H RADICALS; AB-INITIO; INTERSTELLAR CLOUDS; CHEMICAL-DYNAMICS; CH3CCH X(1)A(1);

D O I：

10.1039/b923867k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The kinetics of the reactions of the linear butadiynyl radical, C4H (CCCCH), with a variety of unsaturated hydrocarbons have been studied over the temperature range of 39-300 K using a CRESU (Cinetique de Reaction en Ecoulement Supersonique Uniforme, or reaction kinetics in uniform supersonic flow) apparatus combined with the pulsed laser photolysis-laser induced fluorescence technique. The rate coefficients for all the reactions studied are found to all be in excess of 10(-10) cm(3) molecule(-1) s(-1) over the entire temperature range. They can be fitted with the following expressions (valid from 39 K to 300 K, with RMS deviations of the experimental points from the predicted values shown, to which should be added 10% possible systematic error) for reaction of C4H with alkenes: k(C2H4) = (1.95 +/- 0.17) x 10(-10) (T/298 K)(-0.40) exp(9.4 K/T) cm(3) molecule(-1) s(-1); k(C3H6) = (3.25 +/- 0.12) x 10(-10) (T/298 K)(-0.84) exp(-48.9 K/T) cm(3) molecule(-1) s(-1); k(1-C4H8) = (6.30 +/- 0.35) 10(-10) (T/298 K)(-0.61) exp(-65.0 K/T) cm(3) molecule(-1) s(-1) , for reaction of C4H with dienes: k(C3H4) = (3.70 +/- 0.34) x 10(-10) (T/298 K)(-1.18) exp(-91.1 K/T) cm(3) molecule(-1) s(-1); ; k(1,3-C4H6) = (5.37 +/- 0.30) x 10(-10) (T/298 K)(-1.25) exp(-116.8 K/T) cm(3) molecule(-1) s(-1), and for reaction of C4H with alkynes: k(C2H2) = (1.82 +/- 0.19) x 10(-10) (T/298 K)(-1.06) exp(-65.9 K/T) cm(3) molecule(-1) s(-1); k(C3H4) = (3.20 +/- 0.08) x 10(-10) (T/298 K)(-0.82) exp(-47.5 K/T) cm(3) molecule(-1) s(-1); k(1-C4H6) = (3.48 +/- 0.14) 10(-10) (T/298 K)(-0.65) exp(-58.4 K/T) cm(3) molecule(-1) s(-1). Possible reaction mechanisms and product channels are discussed in detail for each of these reactions. Potential implications of these results for models of low temperature chemical environments, in particular cold interstellar clouds and star-forming regions, are considered.

引用

页码：3677 / 3689

页数：13

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