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Nonadiabatic deactivation of 9H-adenine: a comprehensive picture based on mixed quantum-classical dynamics.

Mixed quantum-classical dynamics simulations at the multireference configuration interaction (MR-CIS) level were performed for 9 H-adenine in order to understand its ultrafast nonradiative decay process. Dynamics simulations were also performed for the model system 6-aminopyrimidine. MR-CIS and complete active space perturbation theory (CASPT2) have been employed to characterize a large variety of qualitatively different conical intersections, the branches of the crossing seam connecting them, and the reaction paths from the Franck-Condon region for 9 H-adenine. The results show a two-step process consisting of ultrashort deactivation from S 3 to S 1 and a longer exponential decay step corresponding to the conversion from S 1 to S 0.

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