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Related Experiment Videos

Double-electron transfer in H(-) + H(+) collisions.

H Bräuning1, H Helm, J S Briggs

  • 1GSI, Atomic Physics Dept., Planckstr. 1, D-64291 Darmstadt, Germany. h.braeuning@gsi.de

Physical Review Letters
|November 13, 2007
PubMed
Summary
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Measurements of double-electron transfer in H(-) + H(+) collisions reveal oscillations in cross sections. A diabatic approach reproduces these findings, suggesting a larger ion-pair splitting is needed.

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Collision Physics

Background:

  • Double-electron transfer in ion-atom collisions is a fundamental process.
  • Previous measurements of H(-) + H(+) collisions lacked detailed cross-section data.
  • Understanding electron transfer dynamics is crucial for plasma physics and astrophysics.

Purpose of the Study:

  • To measure absolute cross sections for double-electron transfer in H(-) + H(+) collisions.
  • To investigate the energy dependence of the double-electron transfer process.
  • To compare experimental results with theoretical models, specifically a diabatic approach.

Main Methods:

  • Experimental measurement of absolute cross sections using a beam experiment.
  • Collisions conducted for center-of-mass energies ranging from 0.5 to 12 keV.

Related Experiment Videos

  • Theoretical calculations employing a diabatic approach.

    • Main Results:

    • Observed clear oscillations in the cross section for double-electron transfer.
    • The experimental data provide new insights into previously reported measurements.
    • The diabatic calculations successfully reproduced the observed oscillatory behavior.

    Conclusions:

    • The oscillatory structure in the cross section provides significant new information.
    • The diabatic approach is a viable method for describing this process.
    • A larger diabatic ion-pair splitting is required for accurate theoretical reproduction.