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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Two-center double-capture interference in fast He2+ + H2 collisions.

Deepankar Misra1, H T Schmidt, M Gudmundsson

  • 1Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden.

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

Scientists observed Young-type interference in two-electron transfer during fast He(2+) + H(2) collisions. Electron capture rates varied significantly with projectile velocity and molecular orientation, confirming quantum mechanical predictions.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Collision Physics

Background:

  • Two-electron transfer processes are fundamental in atomic and molecular collisions.
  • Understanding interference effects in these processes provides insights into quantum mechanical interactions.
  • Previous studies have not observed Young-type interference in two-electron transfer.

Purpose of the Study:

  • To report the first observation of Young-type interference effects in a two-electron transfer process.
  • To investigate the influence of projectile velocity and target orientation on these interference effects.
  • To compare experimental findings with theoretical predictions.

Main Methods:

  • Experimental study of fast (1.2 and 2.0 MeV) Helium ions (He(2+)) colliding with Hydrogen molecules (H(2)).
  • Measurement of double-electron capture rates as a function of projectile velocity and H(2) orientation.
  • Comparison with fully quantum mechanical calculations and a de Broglie wave model.

Main Results:

  • Observed distinct Young-type interference effects in the two-electron transfer process.
  • Demonstrated strong variations in double-electron capture rates with projectile velocity.
  • Showed significant dependence of capture rates on the orientation of the H(2) molecule.
  • Experimental results align with quantum mechanical calculations and a simplified wave picture.

Conclusions:

  • The study provides the first evidence of Young-type interference in two-electron transfer.
  • Projectile velocity and target orientation critically influence electron capture probabilities.
  • Quantum mechanical models accurately describe these complex collision dynamics.