4.8 Article

UV Absorption Spectrum and Photodissociation Channels of the Simplest Criegee Intermediate (CH2OO)

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 1, Pages 50-53

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja510736d

Keywords

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Funding

  1. National Science Foundation [CHE-1300945]
  2. Department of Energy [DE-FG02-05ER15694]
  3. Direct For Mathematical & Physical Scien
  4. Division Of Chemistry [1300945] Funding Source: National Science Foundation

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The lowest-lying singlet states of the simplest Criegee intermediate (CH2OO) have been characterized along the O-O dissociation coordinate using explicitly correlated MRCI-F12 electronic structure theory and large active spaces. It is found that a high-level treatment of dynamic electron-correlation is essential to accurately describe these states. A significant well on the B-state is identified at the MRCI-F12 level with an equilibrium structure that differs substantially from that of the ground X-state. This well is presumably responsible for the apparent vibrational structure in some experimental UV absorption spectra, analogous to the structured Huggins band of the iso-electronic ozone. The B-state potential in the Franck-Condon region is sufficiently accurate that an absorption spectrum calculated with a one-dimensional model agrees remarkably well with experiment.

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