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Electron rescattering in a bicircular laser field.

E Hasović, W Becker, D B Milošević

|May 4, 2016

Summary

This summary is machine-generated.

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Investigating above-threshold ionization in rare-gas atoms using a bicircular field reveals distinct electron scattering patterns. Rescattering breaks the symmetry observed in direct electron spectra, impacting low-momentum velocity maps.

Area of Science:

Atomic and Molecular Physics
Quantum Optics
Strong-Field Physics

Background:

Above-threshold ionization (ATI) is a fundamental process in strong-field physics.
Understanding electron dynamics in intense laser fields is crucial for attosecond science and high-harmonic generation.
Bicircular fields offer unique symmetries not present in linear or circular fields.

Purpose of the Study:

To theoretically investigate above-threshold ionization (ATI) of rare-gas atoms using a bicircular laser field.
To analyze the contributions of direct and rescattered electrons to the ionization spectrum.
To explore the role of discrete rotational symmetry in shaping the electron momentum distribution.

Main Methods:

Employed the improved strong-field approximation (SFA) for theoretical calculations.

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Calculated and visualized quantum orbits leading to specific final electron states.

Analyzed angle-dependent electron spectra and velocity maps.

Main Results:

The angle-dependent electron spectrum exhibits discrete rotational symmetry inherent to the bicircular field.
Backward-scattered electrons show similarities to linear polarization cases, with rotational symmetry-induced variations.
Forward-scattered electrons significantly influence the low-momentum velocity map.
Direct electron spectra display reflection symmetry, which is disrupted by rescattering effects.

Conclusions:

Bicircular fields provide a unique platform to study electron dynamics and symmetry in ATI.
The interplay between direct and rescattered electrons leads to complex spectral features.
The findings offer insights into controlling electron trajectories and understanding fundamental light-matter interactions.