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Related Experiment Videos

Above-threshold dissociative ionization in the intermediate intensity regime.

S Unny1, Y Du, L Zhu

  • 1Department of Chemistry (m/c 111), University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary

Investigating dissociative ionization of I2 molecules at intermediate laser intensities revealed new phenomena. These include continuous recoil energy distributions, distinct ionic states, and anisotropic fragment velocities influenced by resonances.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Laser-Induced Dynamics

Background:

  • Dissociative ionization is a key process in molecular physics.
  • Understanding this process at intermediate laser intensities is crucial for controlling molecular fragmentation.

Purpose of the Study:

  • To investigate dissociative ionization of I2 molecules at intermediate laser intensities (10^10–10^12 W cm⁻²).
  • To identify and characterize novel phenomena associated with this process.

Main Methods:

  • Utilized velocity map imaging technique.
  • Studied the diatomic iodine molecule (I2) as a model system.

Main Results:

  • Observed a continuous distribution of fragment recoil energies, peaking at zero kinetic energy.

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  • Identified a set of constant dissociative ionic states.
  • Detected strong anisotropy in fragment velocity distributions, which was reduced by intermediate resonances.

    • Conclusions:

    • The study reveals complex dynamics in dissociative ionization.
    • Intermediate resonances play a significant role in modulating fragment velocity anisotropy.