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• W2008164811 abstract "The oxygen isotope fractionation associated with O+CO→CO2 reaction was investigated experimentally where the oxygen atom was derived from ozone or oxygen photolysis. The isotopic composition of the product CO2 was analyzed by mass spectrometry. A kinetic model was used to calculate the expected CO2 composition based on available reaction rates and their modifications for isotopic variants of the participating molecules. A comparison of the two (experimental data and model predictions) shows that the product CO2 is endowed with an anomalous enrichment of heavy oxygen isotopes. The enrichment is similar to that observed earlier in case of O3 produced by O+O2 reaction and varies from 70‰ to 136‰ for O18 and 41‰ to 83‰ for O17. Cross plot of δO17 and δO18 of CO2 shows a linear relation with slope of ∼0.90 for different experimental configurations. The enrichment observed in CO2 does not depend on the isotopic composition of the O atom or the sources from which it is produced. A plot of Δ(δO17) versus Δ(δO18) (two enrichments) shows linear correlation with the best fit line having a slope of ∼0.8. As in case of ozone, this anomalous enrichment can be explained by invoking the concept of differential randomization/stabilization time scale for two types of intermediate transition complex which forms symmetric (O16C12O16) molecule in one case and asymmetric (O16C12O18 and O16C12O17) molecules in the other. The δC13 value of CO2 is also found to be different from that of the initial CO due to the mass dependent fractionation processes that occur in the O+CO→CO2 reaction. Negative values of Δ(δC13) (∼12.1‰) occur due to the preference of C12 in CO2* formation and stabilization. By contrast, at lower pressures (∼100torr) surface induced deactivation makes Δ(δC13) zero or slightly positive." @default.
• W2008164811 created "2016-06-24" @default.
• W2008164811 creator A5008520101 @default.
• W2008164811 creator A5031157949 @default.
• W2008164811 date "2006-06-15" @default.
• W2008164811 modified "2023-09-23" @default.
• W2008164811 title "Anomalous oxygen isotope enrichment in CO2 produced from O+CO: Estimates based on experimental results and model predictions" @default.
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• W2008164811 doi "https://doi.org/10.1063/1.2206584" @default.
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