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Correlation between double and nonresonant single ionization.

R Wiehle1, B Witzel

  • 1Department of Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Strasse 3, Germany.

Physical Review Letters
|December 18, 2002
PubMed
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We studied xenon photoionization using intense laser pulses, observing how electrons and Xe2+ ions form. Nonresonant ionization produces low-energy electrons crucial for Xe2+ formation via backscattering.

Area of Science:

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

Background:

  • Photoionization is a fundamental process where atoms absorb photons to eject electrons.
  • Understanding multi-electron ionization dynamics is crucial for fields like attosecond science and plasma physics.
  • Xenon (Xe) is a commonly used atom for studying complex ionization phenomena due to its electronic structure.

Purpose of the Study:

  • To investigate the simultaneous production of electrons and Xe2+ ions in xenon photoionization.
  • To identify the electronic states populated during ionization by analyzing electron spectra.
  • To elucidate the mechanism of Xe2+ formation, particularly the role of nonresonant ionization and electron backscattering.

Main Methods:

  • Simultaneous measurement of electrons and ions using energy and angular resolved spectroscopy.

Related Experiment Videos

  • Irradiation of xenon gas with an 800-nm, 100-fs laser pulse at varying intensities.
  • Analysis of electron spectra to determine populated electronic states and ionization pathways.

    • Main Results:

    • Observed energy and angular resolved electron spectra revealing populated electronic states.
    • Detected Xe2+ ions concurrently with electrons from a 9-photon nonresonant ionization process.
    • Established that low-energy electrons from nonresonant ionization contribute to Xe2+ formation via backscattering.

    Conclusions:

    • The study clarifies the complex ionization dynamics of xenon under intense laser fields.
    • Nonresonant ionization plays a significant role in producing low-energy electrons essential for subsequent ion formation.
    • The findings contribute to a deeper understanding of multi-electron dynamics and ion pair creation mechanisms.