Low-Temperature Rate Coefficients for Reactions of the Ethynyl Radical (C2H) with C3H4 Isomers Methylacetylene and Allene

Autor:	Stephen R. Leone, Ray Hoobler
Rok vydání:	1999
Předmět:	Arrhenius equation Ethynyl radical Allene Analytical chemistry Atmospheric temperature range Photochemistry Propyne Reaction rate chemistry.chemical_compound symbols.namesake Reaction rate constant chemistry symbols Physical and Theoretical Chemistry Propadiene
Zdroj:	The Journal of Physical Chemistry A. 103:1342-1346
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp9839596
Popis:	Low-temperature rate coefficients for the reactions C2H + C3H4 → products [C3H4 = methylacetylene (propyne) CH3CCH and allene (propadiene) CH2CCH2] are measured over the temperature range of 155−298 K. Absolute rate constants are determined using laser photolysis and transient infrared absorption spectroscopy. Both reactions are fast, approaching the kinetic limit and have either no temperature dependence or a slight negative temperature dependence. Over the experimental temperature range, the rate constants are fit to the following Arrhenius expressions: kCH3CCH = (1.6 ± 0.4) × 10-10 exp[(71 ± 50)/T] cm3 molecule-1 s-1 and kCH2CCH2 = (1.3 ± 0.6) × 10-10 exp[(103 ± 136)/T] cm3 molecule-1 s-1. The corresponding rate constants at 298 K are kCH3CCH = (1.9 ± 0.3) × 10-10 cm3 molecule-1 s-1 and kCH2CCH2 = (1.7 ± 0.3) × 10-10 cm3 molecule-1 s-1. These measurements provide new reaction rate coefficients for the ethynyl radical, C2H, with C3H4 unsaturated hydrocarbons. These are necessary to extend current photo...
Databáze:	OpenAIRE
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