Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 39, Pages 19839-19849Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp405574q
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Funding
- National Science Foundation [CHE-1150851]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1150851] Funding Source: National Science Foundation
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The photophysics of benzaldehyde are analyzed through the lens of TD-DFT adiabatic excited 1, states and Boys or Edmiston-Ruedenberg localized diabatic states. We predict rate constants for two processes in excited benzaldehyde: (i) the intersystem crossing from S-1 -> T-2 and (ii) the phosphorescence from T-1 -> S-0. We also study (iii) the conical intersection between T-2 and T-1 that is putatively responsible for an ultrafast internal conversion process, T-2 -> T-1. In agreement with Ohmori et al. (J. Phys. Chem. 1988, 92 (5), 1086-1093), our results suggest that the S-1 -> T-2 intersystem crossing in benzaldehyde is rapid not only because of a large spin-orbit matrix element (i.e., El-Sayed's rule) but also because of a fortuitously small energy barrier. Furthermore, when studying the T-2 -> T-1 internal conversion, we find that both Boys and Edmiston-Ruedenberg localization give remarkably stable and accurate diabatic states which will be useful for ongoing studies of dynamics near conical intersections. To our knowledge, this is the first example whereby localized diabatization techniques have been tested and have successfully recovered the topology of a conical intersection.
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