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Role of the ionic potential in high harmonic generation
1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
Physical Review Letters
|September 26, 2012
Summary
Investigating high harmonic generation in argon atoms reveals the ionic potential
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Dynamics
- Strong Field Physics
Background:
- Recollision processes offer insights into electronic wave function dynamics.
- The complexity of strong field interactions couples many degrees of freedom, posing limitations.
- Understanding the ionic potential's role is crucial for strong field phenomena.
Purpose of the Study:
- To decouple the steps in recollision processes.
- To resolve the specific role of the ionic potential in strong field phenomena.
- To investigate the vectorial properties of laser-atom interactions.
Main Methods:
- Measurement of high harmonic generation from argon atoms.
- Manipulation of laser field polarization to probe vectorial interactions.
- Spatiotemporal and spectral analysis of emitted light.
Main Results:
- The ionic core significantly influences all stages of the laser-atom interaction.
- Coulomb focusing causes angular deflection of electrons prior to recombination.
- The ionic potential impacts the spatiotemporal characteristics of emitted high harmonics.
Conclusions:
- The ionic potential is central to strong field phenomena.
- Decoupling recollision steps clarifies the interaction mechanism.
- Detailed analysis reveals the ionic core's critical role in electron dynamics and light emission.
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