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We observed multiply charged argon and carbon ions from argon clusters using a nanosecond laser. Ion yield depends on cluster size, density, and dopant photostability, suggesting a novel ionization mechanism.

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Area of Science:

  • Atomic and Molecular Physics
  • Laser-Matter Interactions
  • Plasma Physics

Background:

  • Coulomb explosion is a fundamental process in laser-driven cluster ionization.
  • Understanding the dynamics of multiply charged ion formation is crucial for controlling laser-plasma interactions.

Purpose of the Study:

  • To experimentally investigate Coulomb explosion dynamics in argon clusters doped with aromatic chromophores.
  • To elucidate the mechanisms responsible for the formation of multiply charged atomic ions (Ar^n+ and C^n+).

Main Methods:

  • Utilized a nanosecond laser at 532 nm with intensities below 10^12 W/cm^2.
  • Analyzed multiply charged atomic ions (Ar^n+, 1 <= n <= 7 and C^n+, 1 <= n <= 4) produced from doped argon clusters.
  • Investigated the dependence of ion yield on cluster size, number density, and dopant photostability.

Main Results:

  • Observed multiply charged argon and carbon atomic ions from doped argon clusters.
  • Demonstrated that the yield of Ar^n+ is sensitive to cluster size, density, and dopant photostability.
  • Proposed a mechanism involving resonant absorption by Ar^+ leading to high ionization and electron stripping prior to Coulomb explosion.

Conclusions:

  • The study provides experimental evidence for Coulomb explosion in doped argon clusters under specific laser conditions.
  • A novel ionization mechanism is proposed where resonant absorption and subsequent electron stripping contribute to the formation of highly charged atomic ions.
  • The findings highlight the role of cluster properties and dopant characteristics in controlling laser-induced ionization processes.