Multi-isotope study of fractionation effects in the ozone formation process

The isotope fractionation of all ozone isotopologs of mass 48–54 u has been measured with high accuracy. The data represent a standard for the magnitude of the ozone isotope effect since pressure, temperature, and composition of the gas in which ozone is produced are well known. While 17O17O17O and 18O18O18O are depleted by −1.5% and −3.9%, respectively, all others are enriched with 16O17O18O showing the highest value of 19.8%. Enrichments or depletions are independent of the isotope composition of the oxygen gas.