THE CRIEGEE INTERMEDIATE-ACETIC ACID REACTION EXPLORED BY FOURIER TRANSFORM MICROWAVE SPECTROSCOPY

Liu, Yi-Ting

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Description

Title

THE CRIEGEE INTERMEDIATE-ACETIC ACID REACTION EXPLORED BY FOURIER TRANSFORM MICROWAVE SPECTROSCOPY

Author(s)

Liu, Yi-Ting

Contributor(s)

Endo, Yasuki

Issue Date

2023-06-21

Keyword(s)

Atmospheric science

Abstract

Rapid reactions of organic acids with Criegee intermediates provide efficient gas phase removal processes and are proposed to trigger the formation of atmospheric aerosols. The gas phase reaction between the simplest Criegee intermediate, CH₂OO, and acetic acid has been investigated by pulsed discharge nozzle Fourier transform microwave spectroscopy (PDN-FTMW). Two low lying conformers of hydroperoxymethyl acetate (HOOCH₂OCOCH₃, HPMA), which serves as the dominant nascent product from this reaction, were observed in the discharged plasma of a CH₂I₂/O₂/acetic acid gas mixture. Due to the three-fold methyl internal rotation and the low barrier height of the hindered methyl rotation, most of the observed pure rotational transitions in 13-21 GHz show large splitting corresponding to the A/E components. The relative abundance of the two observed hydroperoxymethyl acetate isomers is in agreement with the calculated relative energy. Also, the dehydrated product of HPMA, formic acid anhydride (OHCOCOCH₃), was observed in this work.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122464

DOI

https://doi.org/10.15278/isms.2023.6777

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