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Manipulating ion-atom collisions with coherent electromagnetic radiation.
1Department of Physics and Astronomy, York University, Toronto, Ontario, Canada M3J 1P3.
Physical Review Letters
|August 23, 2002
Summary
Laser-assisted ion-atom collisions are influenced by laser field phase and wavelength. Electronic transitions occur via combined ion-field action or separate capture and ionization events.
Area of Science:
- Atomic and Molecular Physics
- Quantum Mechanics
- Laser-Plasma Interactions
Background:
- Understanding ion-atom collisions is crucial in plasma physics.
- Laser fields can significantly alter atomic collision dynamics.
Purpose of the Study:
- To investigate laser-assisted ion-atom collisions using a nonperturbative quantum mechanical approach.
- To analyze the influence of laser field parameters on collision outcomes.
Main Methods:
- Nonperturbative quantum mechanical treatment of electronic motion.
- Simulation of the Helium ion (He(2+)) - Hydrogen atom (H) system at 2 keV/amu.
Main Results:
- Collision dynamics are highly sensitive to the initial laser field phase and wavelength.
- At low frequencies, electronic transitions result from the combined action of the laser field and projectile ion.
- Above the one-photon ionization threshold, transitions separate into modified collisional capture and field ionization.
Conclusions:
- Laser field parameters critically control electronic transitions in ion-atom collisions.
- The study provides insights into distinct mechanisms governing electron dynamics under laser influence.