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• W2752202212 endingPage "13392" @default.
• W2752202212 startingPage "13387" @default.
• W2752202212 abstract "Criegee intermediates (CIs), mainly formed from gas-phase ozonolysis of alkenes, are considered as atmospheric oxidants besides OH and NO3 radicals as well as ozone. Direct CI measurement techniques are inevitably needed for reliable assessment of CIs’ role in atmospheric processes. We found that CIs from ozonolysis reactions can be directly probed by means of chemical ionization mass spectrometry with a detection limit of about 104–105 molecules cm–3. Results from quantum chemical calculations support the experimental findings. The simplest CI, CH2OO, is detectable as an adduct with protonated ethers, preferably with protonated tetrahydrofuran. Kinetic measurements yielded k(CH2OO + SO2) = (3.3 ± 0.9) × 10–11 and k(CH2OO + acetic acid) = (1.25 ± 0.30) × 10–10 cm3 molecule–1 s–1 at 295 ± 2 K, in very good agreement with recent measurements using diiodomethane photolysis for CH2OO generation. CIs from the ozonolysis of cyclohexene, acting as surrogate for cyclic terpenes, are followed as protonated species (CI)H+ using protonated amines as reagent ions. Kinetic investigations indicate a different reactivity of cyclohexene-derived CIs compared with that of simple CIs, such as CH2OO. It is supposed that the aldehyde group significantly influences the CI reactivity of the cyclohexene-derived CIs. The direct CI detection method presented here should allow study of the formation and reactivity of a wide range of different CIs formed from atmospheric ozonolysis reactions." @default.
• W2752202212 created "2017-09-15" @default.
• W2752202212 creator A5003239040 @default.
• W2752202212 creator A5012499684 @default.
• W2752202212 creator A5089404351 @default.
• W2752202212 date "2017-09-14" @default.
• W2752202212 modified "2023-10-10" @default.
• W2752202212 title "Direct Probing of Criegee Intermediates from Gas-Phase Ozonolysis Using Chemical Ionization Mass Spectrometry" @default.
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• W2752202212 doi "https://doi.org/10.1021/jacs.7b05849" @default.
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• W2752202212 hasPublicationYear "2017" @default.
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