Reaction rates of [formula omitted] atom with fluoroethanes at 1000–1400 K

Abstract

The overall rate constants for reactions of O( 3 P) with three fluoroethanes, O( 3 P)+ CH 3 CH 2 F→ OH+ CH 2 CH 2 F/ CH 3 CHF (1), O( 3 P)+ CH 2 FCH 2 F→ OH+ CHFCH 2 F (2), and O( 3 P)+ CH 3 CHF 2→ OH+ CH 2 CHF 2/ CH 3 CF 2 (3), were measured by laser flash photolysis in shock heated sample gases at 1000–1400 K. The rate constants were obtained in the simple Arrhenius form, k= Aexp(− E a/ RT), where A=2.19×10 −9, 1.24×10 −9 and 7.43×10 −9 cm 3 molecule −1 s −1 and E a=58.0, 57.0 and 82.7 kJ mol −1, and uncertainty factors for k at 2 σ level are F=1.36, 1.27 and 1.19, respectively. The effect of substitution of the fluorine atom on the overall rate constant is discussed in comparison with the corresponding rates for a series of alkanes and fluoromethanes.