Abstract
The kinetics of the gas-phase reactions of chlorine atoms with fluoromethane (CH3F) and D-fluoromethane (CD3F) was studied experimentally. The relative rate method was applied using Cl+CH4 as the reference reaction. The rate constants for H-abstraction from CH3F (kH) and D-abstraction from CD3F (kD) were measured in the temperature range of 298–527K and at a total pressure of 100Torr using N2 as a diluent. The temperature dependency of the rate constants are described by the expressions: kH=(1.65±0.26)×10−11×exp(−1150±30/T) and kD=(1.21±0.14)×10−11×exp(−1600±25/T)cm3molecule−1s−1. The kinetic isotope effect, described by the ratio kH/kD, was found to be 6.2±0.4 at room temperature.
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