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Time-resolved difference absorption spectra recorded at 298 K and 7.4 Torr in the IAMS experiment resulting from (Upper) the photolysis of 1,3-diiodobut-2-ene in the presence of O2 and (Lower) subsequent addition of [SO2] = 1.0 × 1015 cm−3. In addition to MVK-oxide, the transient spectra contain the spectral signatures of side products including IO and I2 (see main text, SO2 scavenger experiments section).
