Two-Dimensional Electronic Spectroscopy of Benzene, Phenol, and Their Dimer: An Efficient First-Principles Simulation...

Area of Science:

• Computational Chemistry
• Spectroscopy
• Quantum Mechanics

Background:

• Two-dimensional electronic spectroscopy (2DUV) in the ultraviolet region is crucial for understanding coupled UV-active chromophores.
• Accurate simulations require computationally intensive multiconfigurational approaches to resolve doubly excited and charge transfer states.

Purpose of the Study:

• To develop an efficient computational approach for simulating 2DUV spectra.
• To reduce the computational cost of accurate 2DUV spectral simulations for molecules like benzene and phenol.
• To enable accurate modeling of electronic coupling in UV-chromophores within protein environments.

Main Methods:

• Established a highly accurate multiconfigurational recipe by comparing with experimental data.
• Utilized restricted active space schemes to reduce active spaces and configuration state functions.
• Validated the method on a model proteic system in water, including line broadening effects.

Main Results:

• Demonstrated significant reduction in computational cost without sacrificing accuracy in 2DUV spectral predictions.
• Provided reference gas-phase transition energies and dipole moments for exciton Hamiltonian construction.
• Successfully applied the method to a realistic model proteic system.

Conclusions:

• The proposed efficient computational recipe accurately predicts 2DUV spectra.
• This method significantly lowers the barrier for simulating complex UV-chromophore systems.
• Enables direct comparison with experimental 2DUV spectra by accounting for environmental effects.