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 Title: CRIEGEE INTERMEDIATES REACTIONS WITH FORMIC ACID PROBED BY FTMW SPECTROSCOPY Author(s): Cabezas, Carlos Contributor(s): Endo, Yasuki Subject(s): Atmospheric science Abstract: Gas-phase ozonolysis is a major degradation mechanism of alkenes in the Earth's atmosphere and forms Criegee intermediates (CIs), carbonyl oxides, as reactive intermediates. The chemistry of CIs plays a central role in controlling the budgets of many tropospheric species including OH, organic acids, and secondary organic aerosols (SOA). The reaction of CIs with organic acids can provide a pathway in which alkenes are converted to low-volatility compounds and thus contribute to the formation of SOA. Here we report spectroscopic investigation, through pure rotational spectroscopy, of the reaction between the simplest Criegee intermediate, CH$_{2}$OO, and the simplest organic acid, the formic acid, HCOOH. In this experiment, CH$_{2}$OO molecules have been generated in the discharged plasma of a CH$_{2}$I$_{2}$/O$_{2}$ mixture, which containing a small amount of HCOOH enough to react with CH$_{2}$OO. The resulting products (including CH$_{2}$OO) were characterized by Fourier-transform microwave (FTMW) spectroscopy. Rotational transitions in the 6-40 GHz frequency range were observed by FTMW spectroscopy together with MW-mmW and MW-MW double-resonance techniques. Preliminary results for the reaction of both conformers of the methyl-substituted Criegee intermediate, CH$_{3}$CHOO, with formic acid are also presented. Issue Date: 2019-06-20 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/104525 DOI: 10.15278/isms.2019.RJ05 Rights Information: Copyright 2019 Carlos Cabezas Date Available in IDEALS: 2019-07-152020-01-25
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