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 kF+H2S/kF+CH4 and kF+D2S/kF+CH4 were determined by a discharge-flow-mass spectrometric technique. By combining the values for these ratios with the value for kF+CH4 at 298 K, the values kF+H2S=(1.46±0.12)×10−10 cm3 molecule−1 s−1 and kF+D2S=(1.42±0.12)×10−10 cm3 molecule−1 s−1 were obtained. The kinetic isotope effect kF+H2S/kF+D2S was determined directly and the value 1.04±0.02 was obtained. The results of this study are compared with previous literature data.