Cigrang, LLE; Green, JA; Gómez, S; Cerezo, J; Improta, R; Prampolini, G; Santoro, F; Cigrang, LLE; Green, JA; Gómez, S; Cerezo, J; Improta, R; Prampolini, G; Santoro, F; Worth, GA; - view fewer (2024) Non-adiabatic direct quantum dynamics using force fields: Toward solvation. The Journal of Chemical Physics , 160 (17) , Article 174120. 10.1063/5.0204911.

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Abstract

Quantum dynamics simulations are becoming a powerful tool for understanding photo-excited molecules. Their poor scaling, however, means that it is hard to study molecules with more than a few atoms accurately, and a major challenge at the moment is the inclusion of the molecular environment. Here, we present a proof of principle for a way to break the two bottlenecks preventing large but accurate simulations. First, the problem of providing the potential energy surfaces for a general system is addressed by parameterizing a standard force field to reproduce the potential surfaces of the molecule’s excited-states, including the all-important vibronic coupling. While not shown here, this would trivially enable the use of an explicit solvent. Second, to help the scaling of the nuclear dynamics propagation, a hierarchy of approximations is introduced to the variational multi-configurational Gaussian method that retains the variational quantum wavepacket description of the key quantum degrees of freedom and uses classical trajectories for the remaining in a quantum mechanics/molecular mechanics like approach. The method is referred to as force field quantum dynamics (FF-QD), and a two-state ππ*/nπ* model of uracil, excited to its lowest bright ππ* state, is used as a test case.

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