Kinetics of the reaction between vinyl radical and ethylene

Abstract

The C 2H 3 + C 2H 4 reaction was studied using the laser photolysis/photoionization mass spectrometry technique at T = 625–950 K and bath gas (helium) densities of (6–12) × 10 16 atom cm −3. Reaction rate constants can be described by the expression k 1 = 10 −11.69 ± 0.44 exp (−(2830 ± 790) K/ T) cm 3 molecule −1 s −1. C 4H 6 and C 4H 7 were detected as primary products; thermal stability of C 4H 7 at 950 K indicates that it is a delocalized radical. The experimental results are compared with predictions obtained in master equation modeling based on the potential energy surface of Miller (J. Phys. Chem. A 108 (2004) 2268).