Measurements of the bimolecular rate constants for S + O 2 → SO + O and CS 2 + O 2 → CS + SO 2 at high temperatures

The bimolecular reactions in the title were measured behind shock waves by monitoring the O‐atom production in COSO 2 Ar and CS 2 O 2 Ar mixtures over the temperature range between 1400 and 2200 K. A value of the rate constant for S + O 2 → SO + O was evaluated to be (3.8 ± 0.7) × 10 12 cm 3 mol −1 s −1 between 1900 and 2200 K. This was connected with the data at lower temperatures to give an expression k 2 = 10 10.85 T 0.52 cm 3 mol −1 s −1 between 250 and 2200 K. An expression of the rate constant for CS 2 + O 2 → CS + SO 2 was obtained to be k 21 = 10 12.0 exp(−32 kcal mol −1 / RT ) cm 3 mol −1 s −1 with an error factor of 2 between 1500 and 2100 K.