A state-specific polarizable continuum model time dependent density functional theory method for excited state...

Area of Science:

• Computational Chemistry
• Quantum Chemistry
• Spectroscopy

Background:

• Accurately modeling solvent effects is crucial for understanding molecular properties.
• Time-dependent density functional theory (TD-DFT) is a powerful tool for studying excited electronic states.
• Existing linear response (LR) models have limitations in describing solvent effects.

Purpose of the Study:

• To develop and implement an effective state-specific (SS) model for solvent effects within TD-DFT.
• To compare the performance of the SS model against the conventional linear response (LR) model.
• To assess the utility of these models for calculating spectroscopic properties and solvent relaxation energies.

Main Methods:

• Developed and coded a state-specific (SS) model within the polarizable continuum model (PCM) framework.
• Employed time-dependent density functional theory (TD-DFT) for excited state computations.
• Compared SS and LR models using benchmark systems like coumarin 153 and formaldehyde in various solvents.

Main Results:

• The SS model effectively incorporates solvent effects in TD-DFT calculations.
• Both SS and LR models show complementarity, with SS offering advantages for polar solvents.
• The models provide access to various spectroscopic properties and solvent relaxation energies.

Conclusions:

• The developed SS-PCM-TD-DFT model is effective for studying excited electronic states.
• This approach enables reliable computation of spectroscopic properties for large molecules in solution.
• The favorable scaling and availability of these models facilitate applications in diverse scientific fields.