Measurements of the bimolecular rate constants for S + O2→ SO + O and CS2+ O2→ CS + SO2at high temperatures

The bimolecular reactions in the title were measured behind shock waves by monitoring the O‐atom production in COSO2Ar and CS2O2Ar mixtures over the temperature range between 1400 and 2200 K. A value of the rate constant for S + O2→ SO + O was evaluated to be (3.8 ± 0.7) × 1012cm3mol−1s−1between 1900 and 2200 K. This was connected with the data at lower temperatures to give an expressionk2= 1010.85T0.52cm3mol−1s−1between 250 and 2200 K. An expression of the rate constant for CS2+ O2→ CS + SO2was obtained to bek21= 1012.0exp(−32 kcal mol−1/RT) cm3mol−1s−1with an error factor of 2 between 1500 and 2100 K.