Hydrogen Abstraction Reactions by NH₂(X²B₁)‐Radicals from Hydrocarbons in the Gas Phase

Abstract

Abstract Rate constants for the reactions of the NH 2 (X 2 B 1 ) radical with ethane, propane and cyclohexane were measured in an isothermal flow system. Kinetic data were obtained at 4 mbar helium pressure in the high temperature range given below. [NH 2 ](t)‐profiles were mapped at pseudo‐first order conditions [NH 2 ] 0 →[RH] 0 with the laser induced fluorescence technique. The temperature dependance of the rate constants is represented by the following Arrhenius‐expressions: A in [cm 3 /mol·s] and E A in [kJ/mol]: magnified image A correlation of the activation energy with the energy of the broken C–H bond of various hydrocarbons is discussed.