Showing papers by "Roger Atkinson published in 1978"

Absolute rate constants for the reactions of O(3P) atoms and OH radicals with SiH4 over the temperature range of 297–438°K

Abstract: Absolute rate constants for the reaction of SiH4 with O(3P) atoms and OH radicals have been determined over the temperature range 297°–438°K using flash photolysis–NO2 chemiluminescence and flash photolysis–resonance fluorescence techniques, respectively. The Arrhenius expressions obtained are where the error limits in the Arrhenius activation energies are the estimated overall error limits. Rate data for the reactions of SiH4, CH4, and H2S with O(3P), H, and F atoms and with OH, CH3, and CF3 radicals are compared, showing that H2S and SiH4, which have similar bond energies, have reasonably similar reactivities toward these atoms and radicals.

Kinetics of the reaction O(3P) + SO2 + M SO3 + M over the temperature range of 299°–440°K

Abstract: Rate constants for the reaction O(3P) + SO2 + M have been determined over the temperature range of 299°–440°K, using a flash photolysis–NO2 chemiluminescence technique. For MAr, the Arrhenius expression was obtained. At room temperature k2Ar = (1.05 ± 0.21) × 10−33 cm6/molec2·sec. In addition, the rate constants k2 = (1.37 + 0.27) × 10−33 cm6/molec2·sec, k2 = (9.5 ± 3.0) ± 10−33 cm6/molec2·sec, k3 = (1.1 ± 0.2) ± 10−31 cm6/molec2·sec, and k3 = (2.6 − 0.9) ± 10−31 cm6/molec2·sec were obtained at room temperature where k3M is the rate constant for the reaction O + NO + M NO2 + M. The rate data are compared and discussed with literature values.