caa a22 4500 475823680 CHVBK 20180406123825.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1023/A:1006257800929 doi (NATIONALLICENCE)springer-10.1023/A:1006257800929 Products and Mechanism of the Gas Phase Reaction of Ozone with β-Pinene [Elektronische Daten] [Richard Winterhalter, Peter Neeb, Dirk Grossmann, Antje Kolloff, Osamu Horie, Geert Moortgat] Gas phase ozonolysis of β-pinene was performedin a 570 l static reactor at 730 Torr and 296 K insynthetic air and the products were analysed by acombination of gas phase FTIR spectroscopy, HPLC andIC analyses of gas phase and aerosol samples,respectively. The reaction mechanism was investigatedby adding HCHO, HCOOH and H2O as Criegeeintermediate scavenger and cyclohexane as OH radicalscavenger. Main identified products (yields inparentheses) in the presence of cyclohexane as OHradical scavenger were HCHO (0.65 ± 0.04),nopinone (0.16 ± 0.04), 3-hydroxy-nopinone (0.15± 0.05), CO2 (0.20 ± 0.04), CO (0.030± 0.002), HCOOH (0.020 ± 0.002), the secondaryozonide of β-pinene (0.16 ± 0.05), andcis-pinic acid (0.02 ± 0.01). The decompositionof the primary ozonide was found to yieldpredominantly the excited C9-Criegee intermediateand HCHO (0.84 ± 0.04) and to a minor extent theexcited CH2OO intermediate and nopinone (0.16± 0.04). Roughly 40% of the excitedC9-Criegee intermediate becomes stabilised andcould be shown to react with HCHO, HCOOH and H2O. The atmospherically important reaction of thestabilised C9-Criegee intermediate with H2Owas found to result in a nopinone increase of (0.35± 0.05) and in the formation of H2O2(0.24 ± 0.03). Based on the observed products,the unimolecular decomposition/isomerisationchannels of the C9-Criegee intermediate arediscussed in terms of the hydroperoxide and esterchannels. Subsequent reactions of the nopinonylradical, formed in the hydroperoxide channel, lead tomajor products like 3-hydroxy-nopinone but also tominor products like cis-pinic acid. A mechanismfor the formation of this dicarboxylic acid isproposed and its possible role in aerosol formationprocesses discussed. Kluwer Academic Publishers, 2000 nopinone nationallicence Criegee intermediates nationallicence secondary ozonide nationallicence cis -pinic acid nationallicence H2O2 nationallicence gas-to-particle conversion nationallicence dicarboxylic acid nationallicence nucleation nationallicence secondary organic aerosol nationallicence Winterhalter Richard Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut Neeb Peter Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut Grossmann Dirk Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut Kolloff Antje Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut Horie Osamu Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut Moortgat Geert Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 35/2(2000-02-01), 165-197 0167-7764 35:2<165 2000 35 10874 https://doi.org/10.1023/A:1006257800929 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1006257800929 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Winterhalter Richard Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut NATIONALLICENCE 700 1- Neeb Peter Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut NATIONALLICENCE 700 1- Grossmann Dirk Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut NATIONALLICENCE 700 1- Kolloff Antje Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut NATIONALLICENCE 700 1- Horie Osamu Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut NATIONALLICENCE 700 1- Moortgat Geert Division of Atmospheric Chemistry, Max-Planck-Institut für Chemie, PO Box 3060, D-55020, Mainz, Germany aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 35/2(2000-02-01), 165-197 0167-7764 35:2<165 2000 35 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer