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- W3211550513 abstract "Criegee intermediates make up a class of molecules that are of significant atmospheric importance. Understanding their electronically excited states guides experimental detection and provides insight into whether solar photolysis plays a role in their removal from the troposphere. The latter is particularly important for large and functionalized Criegee intermediates. In this study, the excited state chemistry of two small Criegee intermediates, formaldehyde oxide (CH2 OO) and acetaldehyde oxide (CH3 CHOO), was modeled to compare their specific dynamics and mechanisms following excitation to the bright ππ* state and to assess the involvement of triplet states to the excited state decay process. Following excitation to the bright ππ* state, the photoexcited population exclusively evolves to form oxygen plus aldehyde products without the involvement of triplet states. This occurs despite the presence of a more thermodynamically stable triplet path and several singlet/triplet energy crossings at the Franck-Condon geometry and contrasts with the photodynamics of related systems such as acetaldehyde and acetone. This work sets the foundations to study Criegee intermediates with greater molecular complexity, wherein a bathochromic shift in the electron absorption profiles may ensure greater removal via solar photolysis." @default.
- W3211550513 created "2021-11-22" @default.
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- W3211550513 date "2021-11-26" @default.
- W3211550513 modified "2023-10-14" @default.
- W3211550513 title "Insights into the Ultrafast Dynamics of CH <sub>2</sub> OO and CH <sub>3</sub> CHOO Following Excitation to the Bright <sup>1</sup> ππ* State: The Role of Singlet and Triplet States" @default.
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- W3211550513 doi "https://doi.org/10.1111/php.13560" @default.
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