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Controlling attosecond double ionization dynamics via molecular alignment.

D Zeidler1, A Staudte, A B Bardon

  • 1National Research Council, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.

Physical Review Letters
|December 31, 2005
PubMed
Summary
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We studied how two electrons leave nitrogen molecules after laser ionization. Electrons are more likely to exit together when the molecule aligns with the laser, suggesting rapid, correlated ejection.

Area of Science:

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

Background:

  • Understanding molecular ionization dynamics is crucial for fields like attosecond science.
  • Nonsequential double ionization (NSDI) in molecules presents complex electron correlation challenges.
  • Laser-induced molecular alignment offers a pathway to control ionization processes.

Purpose of the Study:

  • To investigate the influence of molecular alignment on the dynamics of nonsequential double ionization (NSDI) in nitrogen (N2).
  • To determine the temporal correlation between the two ejected electrons during NSDI.
  • To explore how laser polarization relative to molecular orientation affects ionization probability and electron trajectories.

Main Methods:

  • Utilizing ultrashort laser pulses to first align nitrogen molecules via the Kerr effect.

Related Experiment Videos

  • Employing a subsequent strong probe laser pulse to induce double ionization.
  • Analyzing the angular and temporal characteristics of the ejected electrons.

    • Main Results:

    • Aligned nitrogen molecules show a significantly higher probability of nonsequential double ionization when the probe laser polarization is parallel to the molecular alignment axis.
    • The two electrons are preferentially ejected in the same direction, indicating a short ejection time (within a few hundred attoseconds).
    • For molecules aligned perpendicular to the probe polarization, double ionization is less probable and occurs over a longer timescale.

    Conclusions:

    • Molecular alignment is a critical factor in controlling NSDI pathways.
    • The observed directional electron ejection supports a mechanism where both electrons are released in close temporal proximity.
    • These findings provide insights into ultrafast electron correlation and trajectory dynamics in molecules.