THE CRIEGEE INTERMEDIATE-ACETIC ACID REACTION EXPLORED BY FOURIER TRANSFORM MICROWAVE SPECTROSCOPY
Liu, Yi-Ting
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WI08_1.pptx
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https://hdl.handle.net/2142/122464
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.
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6777.pdf
WI08_1.pptx
