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- W2022269049 abstract "The guanine enol and keto N7H and N9H tautomers have been optimized at the CASSCF/cc-pVDZ levels of theory. Except for the enol N7H tautomer, CASSCF predicts distorted nonplanar S1 state geometries. Among the vibronic simulations carried out with the optimized structures only the enol N7H tautomer qualitatively mirrors the appearance of the experimental R2PI spectrum. Refined symmetry-adapted cluster configuration interaction (SACCI) geometries of the enol N7H tautomer produce simulations in good agreement with experiment and support the assignment of the first vibronic band and associated vibronic features of the R2PI spectrum to this tautomer. The sharp spectral features and the fact that Franck-Condon simulations based on the harmonic approximation allow for a faithful reproduction of the spectral signature associated with the enol N7H tautomer indicate that within the simulated energy window the S1 potential energy surface of this isomer is fairly harmonic and free from conical intersections involved in the S1 state lifetime-shortening relaxation processes of other DNA bases and possibly the remaining tautomers of guanine." @default.
- W2022269049 created "2016-06-24" @default.
- W2022269049 creator A5002487666 @default.
- W2022269049 creator A5028828249 @default.
- W2022269049 date "2006-11-10" @default.
- W2022269049 modified "2023-09-25" @default.
- W2022269049 title "Excited-State Ab Initio Calculations and Multidimensional Franck−Condon Simulations on Guanine" @default.
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- W2022269049 doi "https://doi.org/10.1021/jp062494d" @default.
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