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 ${}^{17}{\mathrm{O}}^{\mathrm{17}}{\mathrm{O}}^{\mathrm{17}}\mathrm{O}$ and ${}^{18}{\mathrm{O}}^{\mathrm{18}}{\mathrm{O}}^{\mathrm{18}}\mathrm{O}$ are depleted by −1.5% and −3.9%, respectively, all others are enriched with ${}^{16}{\mathrm{O}}^{\mathrm{17}}{\mathrm{O}}^{\mathrm{18}}\mathrm{O}$ showing the highest value of 19.8%. Enrichments or depletions are independent of the isotope composition of the oxygen gas.