Spectroscopic characterization of the reaction products between HCl and the simplest Criegee intermediate CH2OO

Cabezas, Carlos

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https://hdl.handle.net/2142/97138 Copy

Description

Title

Spectroscopic characterization of the reaction products between HCl and the simplest Criegee intermediate CH2OO

Author(s)

Cabezas, Carlos

Contributor(s)

Endo, Yasuki

Issue Date

2017-06-19

Keyword(s)

Atmospheric science

Abstract

Carbonyl oxides (R$_{1}$R$_{2}$COO), also known as Criegee intermediates (CIs), react quickly with many trace atmospheric gases, including inorganic gases such as HCl, which are present in polluted urban atmospheres. A theoretical investigation of the reaction between the simplest CI, CH$_{2}$OO, with HCl suggests the formation of chloromethyl hydroperoxide (CMHP) through an insertion mechanism. To gain some insight, we have interrogated the reaction system containing CH$_{2}$OO and HCl through pure rotational spectroscopy. In our experiment, CH$_{2}$OO molecules have been generated in the discharged plasma of a CH$_{2}$I$_{2}$/O$_{2}$ mixture, which containg a small amount of HCl 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 FTMW-mmW and MW-MW double-resonance techniques. The observed species was identified with the help of quantum chemical calculations as the most stable conformer of CMHP. The non observation of other different reaction products together with the absence of spectral features of the complex between HCl and CH$_{2}$OO enable us to understand the pathway of the HCl+CH$_{2}$OO reaction.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/97138

DOI

https://doi.org/10.15278/isms.2017.MJ01

Copyright and License Information

Copyright 2017 Carlos Cabezas

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