Kinetics of Reactions of C2H Radical With Acetylene, O2, Methylacetylene, and Allene in a Pulsed Laval Nozzle Apparatus at T = 103 K

Published

August 1, 2001

Author(s)

A B. Vakhtin, Dwayne E. Heard, I W. Smith, S R. Leone

Abstract

The rate constants of the reactions of C₂H radical with HCidentical with}CH (k₁), O₂(k_{2), CH}d3^Cidentical with}CH(k₃), and H₂C=C=CH₂(k₄) are measured at 103 K using a pulsed Laval nozzle supersonic expansion and the CH(A²δ) chemiluminescence monitor method: k₁ = (1.3 0.3) x 10^-10, k₂ = (3.8 0.9)x10^-11, k₃ = (2.7 0.6) x 10^-10, and k₄ = (2.5 0.6)x10^-10 cm³ molecule^-1 s^-1. These values are compared to previous results and measurements in a continuous Laval nozzle apparatus (accompanying paper by Carty et al.). The non-Arthenius behavior and possible implications of the results for atmospheric chemistry of Titan are discussed.

Citation

Chemical Physics Letters

Volume

344

Issue

No. 3-4

Pub Type

Journals

Keywords

ethynyl radical, low temperature kinetics

Citation

Vakhtin, A. , Heard, D. , Smith, I. and Leone, S. (2001), Kinetics of Reactions of C₂H Radical With Acetylene, O₂, Methylacetylene, and Allene in a Pulsed Laval Nozzle Apparatus at T = 103 K, Chemical Physics Letters (Accessed October 27, 2025)