Recollision dynamics and time delay in strong-field double ionization

Area of Science:

• Atomic and Molecular Physics
• Quantum Optics
• Laser-Matter Interactions

Background:

• Double ionization of atoms by intense laser fields is a complex quantum phenomenon.
• Electron recollision dynamics play a crucial role in understanding ionization processes.

Purpose of the Study:

• To investigate the recollision dynamics in atomic double ionization using intense 780-nm lasers.
• To analyze the influence of nuclear interaction and laser phase on electron escape trajectories.

Main Methods:

• Utilizing three-dimensional classical ensembles to model electron trajectories.
• Simulating atomic interactions with intense laser fields at 0.4 PW/cm^2.
• Examining trajectories with varying time delays between recollision and ionization.

Main Results:

• One electron is influenced by the nucleus post-recollision before escaping.
• The final momentum of the escaped electron is critically dependent on the laser phase at escape.
• The second electron drifts away in a momentum hemisphere opposite to its post-collision motion.

Conclusions:

• Classical ensembles provide insights into the intricate recollision dynamics of double ionization.
• Laser phase and nuclear interaction are key factors determining electron trajectories and final momenta.
• Understanding these dynamics is crucial for advanced laser-driven atomic processes.