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- W2803685265 abstract "We combine quantified natural transition orbital (QNTO) analysis with large-scale linear response time-dependent density functional theory to investigate the concerted [2 + 2] thymine dimerization reaction. This reaction is a main cause of UV-light-induced damage to DNA, but its mechanism has remained poorly understood. QNTO analysis enables the electronic excitations of a molecule to be identified on the basis of their transition origins across a wide range of molecular geometries, allowing the participating excited states to be identified relatively straightforwardly. We identify a barrierless funnel that is responsible for the ultrafast reaction previously indicated in experiments. The reactive state is found to have crossings with several bright excited states, revealing how the initially populated bright states can decay rapidly to the reactive state. We also examine the contribution of environmental factors, such as inclusion of the DNA backbone, which can affect the conformation of the potential energy surfaces of the relevant states." @default.
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- W2803685265 date "2018-05-14" @default.
- W2803685265 modified "2023-09-30" @default.
- W2803685265 title "Photophysics and Photochemistry of DNA Molecules: Electronic Excited States Leading to Thymine Dimerization" @default.
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- W2803685265 doi "https://doi.org/10.1021/acs.jpcc.8b01252" @default.
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