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Sequential penning ionization: harvesting energy with ions.

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Collisions between excited atoms and ions, not neutrals, create doubly charged ions. This novel sequential Penning ionization process, observed in doped superfluid helium droplets, offers new insights into ion formation.

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Area of Science:

  • Atomic and Molecular Physics
  • Chemical Physics
  • Quantum Fluids

Background:

  • Ionization processes typically involve neutral species.
  • Doubly charged ions are often formed through direct high-energy impact or complex multi-step mechanisms.
  • Understanding threshold ionization phenomena is crucial for plasma physics and materials science.

Purpose of the Study:

  • To investigate a novel ionization pathway involving excited atoms and ions.
  • To explore the production of doubly charged ions via sequential Penning ionization.
  • To characterize the influence of dopants and excited states on ionization dynamics.

Main Methods:

  • Utilizing superfluid helium droplets doped with methyl iodide.
  • Exposing doped droplets to electron beams to induce ionization.
  • Analyzing the resulting ions and ejected electrons to identify ionization mechanisms.

Main Results:

  • Observed electron ejection from excited atom-ion collisions, producing doubly charged ions.
  • Enhanced formation of doubly charged iodine atoms at specific energy thresholds.
  • Evidence for sequential Penning ionization as the primary mechanism.

Conclusions:

  • A new ionization pathway involving excited atoms and ions has been identified.
  • Sequential Penning ionization is a viable route to doubly charged ions, particularly in doped superfluid systems.
  • The process can lead to subsequent Coulomb explosions for certain dopants, offering control over fragmentation patterns.