The yields of stabilized Criegee intermediates (sCIs), both CHOO and CHCHOO, produced from ozonolysis of propene at low pressures (7-16 Torr) were measured indirectly using cavity ringdown spectroscopy (CRDS) and chemical titration with an excess amount of sulfur dioxide (SO). The method of monitoring the consumption of SO as a scavenger and the production of secondary formaldehyde (HCHO) allows characterization of the total sCI and the stabilized CHOO yields at low pressure and in a short residence time. Both the total sCI and the stabilized CHOO yields in the propene ozonolysis were found to decrease with decreasing pressure. By extrapolating the 7-16 Torr measurements to the zero-pressure limit, the nascent yield of the total sCIs was determined to be 25 ± 2%. The ranges of nascent yields of stabilized CHOO and stabilized CHCHOO were estimated to be 20-25% and 0-5%, respectively. The branching ratios of the stabilized and high-energy CHOO* and CHCHOO* were also determined.
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