How big is the substituent dependence of the solar photolysis rate of Criegee intermediates?

Literature Information

Publication Date 2018-05-14
DOI 10.1039/C8CP02015A
Impact Factor 3.676
Authors

Cangtao Yin, Kaito Takahashi


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Abstract

Criegee intermediates (CIs) can actively oxidize trace gases in the troposphere, and it is important to quantify their solar photolysis rates. However, experimental measurement has been challenging, and there are differences even in the UV spectra of the simplest CH2OO. In this study, we calculated the absolute UV cross sections for C1 to C3 CIs with multireference quantum chemistry and quantum dynamics methods. Our results gave peak positions, cross sections and spectral widths reproducing the experimental results for CH2OO and (CH3)2COO. For vinyl-CIs, the peak position is greatly redshifted compared to CH2OO, and the cross section is three times larger. This knowledge should help in the future detection of CIs with vinyl groups. Lastly, we showed that for C1 to C3 CIs the solar photolysis rate only varies between 0.08 and 1.03 s−1. This small substituent dependence is very different from other CI decay pathways, such as thermal decomposition and reaction with water vapor, which varied by three orders of magnitude. These rates are too slow to compete with other atmospheric decay pathways such as CI thermal decomposition or CI reaction with water vapor.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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