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Atomic site-sensitive processes in low energy ion-dimer collisions.

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Low energy Argon ions (Ar9+) capture electrons from Argon dimers (Ar2). Collisions show Ar9+ distinguishes atoms in Ar2, favoring electron capture from the near-site atom.

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Area of Science:

  • Atomic and Molecular Physics
  • Chemical Physics
  • Ion-Atom Collisions

Background:

  • Investigating electron capture in ion-molecule collisions is crucial for understanding chemical reactions and plasma physics.
  • Argon dimer (Ar2) targets present a unique system to study projectile interactions with multiple atomic centers.

Purpose of the Study:

  • To investigate electron capture processes for low energy Ar(9+) ions colliding with Ar(2) targets.
  • To analyze charge sharing dynamics as a function of molecular orientation and impact parameter.
  • To determine if projectiles distinguish individual atoms within the Ar2 target.

Main Methods:

  • Experimental measurements of electron capture in Ar(9+) + Ar(2) collisions.
  • Analysis of projectile scattering angles and molecular ion orientation.
  • Comparison with Monte Carlo simulations using the classical over-the-barrier model.

Main Results:

  • A preference for charge-asymmetric dissociation channels was observed.
  • A strong correlation was found between projectile scattering angle and molecular ion orientation.
  • Clear evidence indicates projectiles distinguish individual atoms in the target, favoring near-site capture.

Conclusions:

  • The study provides evidence that Ar(9+) ions can differentiate between atoms in an Ar(2) target.
  • Electron capture is favored from the atom closest to the incoming projectile.
  • The findings offer new insights into the dynamics of ion-dimer collisions.