Kinetics of the reactions F + H₂S and F + D₂S at 298 K

The rate constants for the reactions F + H₂S and F + D₂S at 298 K were determined by a competitive method using the reaction F + CH₄ as a reference reaction. The ratios of rate constants k_{F + H2S}/k_{F + CH4} and k_{F + D2S}/k_{F + CH4} were determined by a discharge-flow-mass spectrometric technique. By combining the values for these ratios with the value for k_{F + CH4} at 298 K, the values k_{F + H2S} = (1.46 ± 0.12) × 10^-10 cm³ molecule^-1 s^-1 and k_{F + D2S} = (1.42 ± 0.12) × 10^-10 cm³ molecule^-1 s^-1 were obtained. The kinetic isotope effect k_{F + H2S}/k_{F + D2S} was determined directly and the value 1.04 ± 0.02 was obtained. The results of this study are compared with previous literature data.