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Rate constants were determined for the quenching reaction of excited triplet sulfur dioxide ( 3 SO 2 ) with the typical triplet quenchers oxygen and nitric oxide, employing the sulfur dioxide photosensitized cis-trans isomerization of butene-2. While the rate constant for  3 SO 2  quenching by nitric oxide (k=7.8±1.9x10 10  liters/mole sec) is near the collision number, the rate constant for quenching by oxygen (k=2.4±0.5x10 8  liters/mole sec) is surprisingly low. The possible signi-ficance of these quenching processes on aerosol formation in photochemical smog is discussed.

The Sulfur Dioxide Photosensitized cis-trans Isomerization of Butene-2 The Quenching Effect of Oxygen and Nitric Oxide