Criegee intermediates reactions with formic acid probed by FTMW spectroscopy

Cabezas, Carlos

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https://hdl.handle.net/2142/104525 Copy

Description

Title

Criegee intermediates reactions with formic acid probed by FTMW spectroscopy

Author(s)

Cabezas, Carlos

Contributor(s)

Endo, Yasuki

Issue Date

2019-06-20

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104525

DOI

https://doi.org/10.15278/isms.2019.RJ05

Copyright and License Information

Copyright 2019 Carlos Cabezas

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