Laser-Induced Electron Symmetry Restoration in Oriented Molecules Made Simple

Area of Science:

• Quantum Chemistry
• Molecular Spectroscopy
• Chemical Physics

Background:

• Electron symmetry governs molecular properties and reaction pathways.
• Laser-induced excitation can break initial electron symmetry by creating superpositions of states with different irreducible representations (IRREPs).

Purpose of the Study:

• To investigate methods for restoring broken electron symmetry in molecules.
• To develop experimentally accessible techniques for manipulating molecular symmetry.

Main Methods:

• Quantum dynamics simulations were performed on oriented benzene and LiCN molecules.
• A reoptimized π-laser pulse was designed to transfer population from an excited state to states with the same IRREP as the ground state.

Main Results:

• The simulations demonstrated that a reoptimized laser pulse can restore the original electron symmetry.
• The excited state component was successfully transferred to other states sharing the ground state's IRREP.
• This method allows for immediate symmetry restoration, unlike previous techniques requiring precise attosecond timing.

Conclusions:

• Restoring electron symmetry using tailored laser pulses is feasible.
• The proposed method offers a simpler and more experimentally viable approach to controlling molecular symmetry.
• This technique has implications for photoelectron spectroscopy and chemical reaction dynamics.