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Related Experiment Videos

Young-type interference in (e, 2e) ionization of H(2).

D S Milne-Brownlie1, M Foster, Junfang Gao

  • 1ARC Centre for Antimatter-Matter Studies, Griffith Unviversity, Nathan, QLD 4111 Australia.

Physical Review Letters
|June 29, 2006
PubMed
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Electron impact ionization of hydrogen molecules shows a unique interference pattern. This Young-type interference modifies the ejected electron

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Electron Scattering

Background:

  • Electron impact ionization is a fundamental process in atomic and molecular physics.
  • Understanding molecular ionization dynamics is crucial for various applications.
  • Previous studies often focused on atomic targets or lacked fully determined kinematics.

Purpose of the Study:

  • To investigate the electron impact single ionization of the hydrogen molecule (H2) with fully determined kinematics.
  • To compare experimental and theoretical results for H2 ionization with those of Helium (He) ionization.
  • To elucidate the role of interference effects in molecular ionization.

Main Methods:

  • Experimental measurement of electron impact single ionization cross-sections and angular distributions.

Related Experiment Videos

  • Theoretical calculations employing advanced quantum mechanical models.
  • Kinematically complete experiments to precisely determine all outgoing particle momenta.
  • Comparison of results for H2 with those for atomic He under identical conditions.

    • Main Results:

    • The ejected electron angular distribution for H2 is significantly modified compared to He.
    • Evidence of Young-type interference between ionization amplitudes from the two centers of the H2 molecule.
    • Observed suppression of the backward scattering (recoil) peak in the ejected electron angular distribution.
    • Quantitative agreement between experimental and theoretical findings for H2 ionization.

    Conclusions:

    • Young-type interference is a key phenomenon in the electron impact ionization of molecules.
    • The molecular structure of H2 leads to distinct ionization dynamics compared to atomic targets.
    • Fully determined kinematics are essential for observing and understanding these interference effects.
    • The study provides a benchmark for theoretical models of molecular ionization.