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Quantum effects in double ionization of argon below the threshold intensity
XiaoLei Hao1, Jing Chen1, WeiDong Li2
1HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100084, China, and Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China.
Physical Review Letters
|March 4, 2014
Summary
Quantum effects in atomic nonsequential double ionization (NSDI) were studied. Quantum interference causes a transition in electron emission patterns, aligning with experimental observations and enhanced by excited state depletion.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Laser-Matter Interactions
Background:
- Nonsequential double ionization (NSDI) of atoms is typically explained by semiclassical or classical models.
- Quantum effects have not been considered necessary for understanding NSDI data.
Purpose of the Study:
- To theoretically investigate electron correlation in argon NSDI using quantum mechanics.
- To explore the role of quantum interference in NSDI emission patterns.
Main Methods:
- Utilized quantum-mechanical S-matrix theory for theoretical study.
- Analyzed electron correlation in argon subjected to low-intensity laser fields.
Main Results:
- Quantum interference between excited states of the singly charged ion causes a transition in electron emission from back-to-back to side-by-side.
- This transition correlates with increasing laser intensity and matches experimental data.
- Excited state depletion enhances this transition at higher intensities.
Conclusions:
- Quantum interference plays a crucial role in NSDI electron emission patterns.
- The quantum-mechanical S-matrix theory accurately describes observed experimental phenomena.
- Classical models are insufficient to explain the observed quantum interference effects in NSDI.
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