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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Subcycle control of electron-electron correlation in double ionization.

Li Zhang1, Xinhua Xie1, Stefan Roither1

  • 1Photonics Institute, Vienna University of Technology, A-1040 Vienna, Austria.

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Summary

We investigated double ionization of neon using orthogonally polarized two-color laser fields. The study demonstrates control over electron emission dynamics by tuning laser pulse shapes, switching between correlated and anticorrelated electron emissions.

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Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Laser-matter interactions

Background:

  • Nonsequential double ionization (NDI) is a complex quantum phenomenon.
  • Understanding electron emission dynamics is crucial for controlling atomic processes.
  • Orthogonally polarized two-color (OTC) laser fields offer unique control parameters.

Purpose of the Study:

  • To investigate the dynamics of double ionization in neon using OTC laser fields.
  • To demonstrate control over two-electron emission by manipulating the laser pulse shape.
  • To explore the transition between correlated and anticorrelated electron emission.

Main Methods:

  • Experimental investigation using coincidence momentum imaging.
  • Utilizing orthogonally polarized two-color (OTC) laser pulses.
  • Theoretical analysis with a semiclassical trajectory model.

Main Results:

  • Demonstrated control over two-electron emission dynamics in neon NDI.
  • Achieved switching between correlated and anticorrelated two-electron emission.
  • Observed control over the directionality of electron emission.
  • Semiclassical simulations qualitatively explained experimental findings via subcycle electron recollision time dependence.

Conclusions:

  • The subcycle shape of OTC laser fields is a key parameter for controlling NDI dynamics.
  • Experimental results are consistent with semiclassical models predicting subcycle control.
  • This work opens avenues for precise control of electron emission in atomic systems.