Electron correlation dynamics in atoms and molecules

Area of Science:

• Quantum dynamics
• Atomic and molecular physics
• Computational chemistry

Background:

• Electron correlation significantly influences atomic and molecular properties.
• Understanding and controlling electron correlation is crucial for predicting chemical behavior and designing new materials.
• Explicitly time-dependent ab initio methods are essential for accurately simulating quantum dynamics.

Purpose of the Study:

• To investigate the possibility of suppressing electron correlation using ultrashort laser pulses.
• To understand the dynamics and timescale of electron correlation's reappearance.
• To identify pathways for preparing specific electronic states, such as Hartree-Fock states.

Main Methods:

• Utilizing explicitly time-dependent ab initio configuration interaction (CI) theory.
• Performing quantum dynamical calculations for atoms and molecules.
• Analyzing electron-electron scattering to characterize correlation dynamics.

Main Results:

• Demonstrated that ultrashort laser pulses can, in certain cases, switch off electronic correlation.
• Characterized the temporal evolution and timescale of correlation's reappearance.
• Identified pathways to prepare uncorrelated (e.g., Hartree-Fock) states from correlated ground states.
• Provided exemplary results for noble gases, alkaline earth elements, and molecules, including Mg.

Conclusions:

• Ultrashort laser pulses offer a potential route to control electron correlation dynamics.
• The ability to manipulate electron correlation opens possibilities for preparing specific electronic states.
• This research provides fundamental insights into quantum dynamics and electron correlation in atomic and molecular systems.