Reactions of ethynyl radicals. Rate constants with CH4, C2H6, and C2D6

Article abstract of DOI:10.1021/j150625a023

The rate constants for the abstraction of H atoms from CH₄, C₂H₆, and D atoms from C₂D₆ by C₂H (ethynyl) radicals have been determined by using a flash photolysis-kinetic spectroscopic technique. The values obtained, at 297 K, are (1.2 ± 0.2) × 10^-12, (6.5 ± 0.4) × 10^-12, and (3.1 ± 0.5) × 10^-12 cm³ molecule^-1 s^-1, respectively. The rate constants are independent of added helium over the pressure range 20-700 torr. The kinetic parameters were determined by monitoring the acetylene product spectroscopically using C₂H-CF₃ as the source of ethynyl radicals.