Ultrafast Dynamics of the Two Lowest Bright Excited States of Cytosine and 1-Methylcytosine: A Quantum Dynamical Study

Journal of Chemical Theory and Computation
Martha Yaghoubi JouybariFabrizio Santoro

Abstract

The nonadiabatic quantum dynamics (QD) of cytosine and 1-methylcytosine in the gas phase is simulated for 250 fs after a photoexcitation to one of the first two bright states. The nuclear wavepacket is propagated on the coupled diabatic potential energy surfaces of the lowest seven excited states, including ππ*, nπ*, and Rydberg states along all the vibrational degrees of freedom. We focus in particular on the interplay between the bright and the dark nπ* states, not considering the decay to the ground electronic state. To run these simulations, we implemented an automatic general procedure to parametrize linear vibronic coupling (LVC) models with time-dependent density functional theory (DFT) computations and interfaced it with Gaussian package. The wavepacket was propagated with the multilayer version of the multiconfigurational time dependent Hartree method. Two different density functionals, PBE0 and CAM-B3LYP, which provide a different description of the relative stability of the lowest energy dark states, were used to parametrize the LVC Hamiltonian. Part of the photoexcited population on lowest HOMO-LUMO transition (π H π L *) decays within less than 100 fs to a nπ* state which mainly involves a promotion of an electron ...Continue Reading

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Citations

Nov 15, 2020·Physical Chemistry Chemical Physics : PCCP·Martha Yaghoubi JouybariFabrizio Santoro
Apr 4, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·James A GreenFabrizio Santoro
Aug 3, 2021·Physical Chemistry Chemical Physics : PCCP·Yanli LiuFabrizio Santoro
Sep 28, 2021·Accounts of Chemical Research·J Patrick ZobelLeticia González

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