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• W3207029325 abstract "Modeling linear absorption spectra of solvated chromophores is highly challenging as contributions are present both from coupling of the electronic states to nuclear vibrations and from solute-solvent interactions. In systems where excited states intersect in the Condon region, significant non-adiabatic contributions to absorption line shapes can also be observed. Here, we introduce a robust approach to model linear absorption spectra accounting for both environmental and non-adiabatic effects from first principles. This model parameterizes a linear vibronic coupling (LVC) Hamiltonian directly from energy gap fluctuations calculated along molecular dynamics (MD) trajectories of the chromophore in solution, accounting for both anharmonicity in the potential and direct solute-solvent interactions. The resulting system dynamics described by the LVC Hamiltonian are solved exactly using the thermalized time-evolving density operator with orthogonal polynomials algorithm (T-TEDOPA). The approach is applied to the linear absorption spectrum of methylene blue in water. We show that the strong shoulder in the experimental spectrum is caused by vibrationally driven population transfer between the bright S1 and the dark S2 states. The treatment of the solvent environment is one of many factors that strongly influence the population transfer and line shape; accurate modeling can only be achieved through the use of explicit quantum mechanical solvation. The efficiency of T-TEDOPA, combined with LVC Hamiltonian parameterizations from MD, leads to an attractive method for describing a large variety of systems in complex environments from first principles." @default.
• W3207029325 created "2021-10-25" @default.
• W3207029325 creator A5009969515 @default.
• W3207029325 creator A5032837587 @default.
• W3207029325 creator A5038738989 @default.
• W3207029325 creator A5040836342 @default.
• W3207029325 creator A5067432120 @default.
• W3207029325 date "2021-10-14" @default.
• W3207029325 modified "2023-10-16" @default.
• W3207029325 title "Influence of non-adiabatic effects on linear absorption spectra in the condensed phase: Methylene blue" @default.
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• W3207029325 doi "https://doi.org/10.1063/5.0062950" @default.

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