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Related Experiment Videos

Probing scattering wave functions close to the nucleus.

D H Madison1, D Fischer, M Foster

  • 1Laboratory for Atomic, Molecular and Optical Research, Physics Department, University of Missouri-Rolla, Rolla, Missouri 65409-0640, USA.

Physical Review Letters
|February 3, 2004
PubMed
Summary
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New research on electron ejection in helium ionization reveals a ring-shaped structure. This finding, observed with carbon ion projectiles, challenges previous theoretical predictions and highlights model limitations at high energies.

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • High-Energy Ion-Atom Collisions

Background:

  • Three-dimensional imaging of electron emission in atomic ionization is crucial for understanding fundamental interactions.
  • Previous theoretical models did not predict the observed ring-shaped electron structure in helium single ionization by fast carbon ions.

Purpose of the Study:

  • To investigate the structure of ejected electrons in helium single ionization by carbon ions at different energies.
  • To compare experimental observations with theoretical predictions and identify limitations of existing models.

Main Methods:

  • Utilizing 3D imaging techniques to detect ejected electrons.
  • Conducting experiments with 100 MeV/amu and 2 MeV/amu C6+ ion projectiles impacting helium targets.

Related Experiment Videos

  • Applying a multiple-scattering model for theoretical analysis.

    • Main Results:

    • Observed a novel ring-shaped electron structure centered on the beam axis, deviating from the expected recoil lobe.
    • Confirmed the presence of this structure at lower projectile energies (2 MeV/amu), where it is now theoretically predicted.
    • Identified a breakdown of the multiple-scattering model at higher energies (100 MeV/amu).

    Conclusions:

    • The observed ring structure suggests complex electron dynamics in ionization processes.
    • Theoretical models need refinement to accurately describe electron emission at high projectile energies.
    • Projectile energy influences the probing distance to the nucleus, impacting model validity.