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Molecular Double Ionization Using Strong Field Few-Cycle Laser Pulses.

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Strong field double ionization of organic molecules is enhanced in conjugated systems. This study correlates electronic structure with increased ionization rates, particularly involving inner orbital electron removal.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Quantum Chemistry

Background:

  • Strong field ionization is crucial for understanding molecular dynamics under intense laser fields.
  • Organic molecules present complex electronic structures influencing ionization pathways.
  • Double ionization, involving the removal of two electrons, is a key process in strong field physics.

Purpose of the Study:

  • To investigate strong field double ionization yields in various organic molecules.
  • To explore the influence of molecular conjugation on double ionization rates.
  • To correlate molecular electronic structure with observed ionization phenomena.

Main Methods:

  • Coincidence detection of fragment ions to measure double ionization.
  • Systematic variation of laser parameters: pulse duration, intensity, and polarization.
  • Study of a series of organic molecules with varying degrees of conjugation.

Main Results:

  • Significant enhancement of double ionization rates observed in conjugated organic molecules.
  • Observed rates exceed predictions based on standard tunneling or multiphoton ionization models.
  • A clear correlation was found between molecular electronic structure and double ionization yields.

Conclusions:

  • Molecular conjugation plays a critical role in enhancing strong field double ionization.
  • The removal of electrons from inner orbitals is highlighted as a key factor in the observed enhancement.
  • Electronic structure calculations provide insights into the mechanisms driving enhanced double ionization.