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Tunneling Ionization Time Resolved by Backpropagation.

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|July 23, 2016
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Summary
This summary is machine-generated.

We determined the ionization time for tunneling ionization using quantum and classical methods. For helium and hydrogen, ionization time is near zero when a large fraction of electrons tunnel out.

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Area of Science:

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

Background:

  • Tunneling ionization is a fundamental process in strong-field physics.
  • Precisely quantifying ionization times is crucial for understanding electron dynamics.
  • Elliptically polarized light introduces complexities in ionization dynamics.

Purpose of the Study:

  • To determine the ionization time in tunneling ionization relative to the peak of an elliptically polarized light pulse.
  • To investigate the relationship between ionization time and the fraction of tunneled electrons.
  • To establish a method applicable to correlated electron motion.

Main Methods:

  • Full quantum mechanical propagation of the electron wave function.
  • Classical backpropagation to identify tunneling parameters.
  • Analysis of single active electrons in helium and hydrogen.

Main Results:

  • The ionization time was found to be close to zero for single active electrons in helium and hydrogen.
  • This near-zero ionization time occurs when a significant fraction of electrons has tunneled.
  • The study provides a method to quantify ionization times.

Conclusions:

  • The developed analysis is essential for quantifying ionization times, especially for complex systems.
  • The findings offer insights into the dynamics of tunneling ionization under elliptical polarization.
  • This work lays the groundwork for studying ionization in systems with correlated electron motion.