Rate constants for the reactions of CO3 and O3 with SO2 have been measured between 300 and 1440K in a high temperature flowing afterglow apparatus. The CO3 rate constants near to the collision rate at low temperatures and fall by about a factor of 50 with temperature until a broad minimum is reached at 9001300K. The highest temperature point shows the increasing rate constant. Comparison to drift tube data taken in a helium buffer shows that total energy controls the reactivity, presumably because the reaction goes through a long lived complex even at 1440K. The reaction of O3 with SO2 was studied up to 1400K. The rate constant is collisional until 700K and then decreases with increasing temperature. Rate constants measured at 1300 and 1400K appear to show an increase, but that observation is questionable since O3 could not be made cleanly. The O3 data at 1200K and below show that total energy controls reactivity in that range.

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