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ION pair dissociation: Spectroscopy and dynamics.

Arthur G Suits1, John W Hepburn

  • 1Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA. asuits@chem.wayne.edu

Annual Review of Physical Chemistry
|April 8, 2006
PubMed
Summary
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New spectroscopy techniques, ion pair imaging spectroscopy (IPIS) and threshold ion pair production spectroscopy (TIPPS), offer high-resolution studies of ion dissociation. These methods provide novel insights into ion thermochemistry and dynamics.

Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Spectroscopy

Background:

  • Ion pair dissociation is a fundamental process in chemical physics.
  • Conventional methods like photoelectron spectroscopy study electron dynamics.
  • A gap exists in high-resolution techniques for studying anion dissociation dynamics.

Purpose of the Study:

  • To introduce novel high-resolution spectroscopic methods for studying ion pair dissociation.
  • To investigate ion thermochemistry, spectroscopy, and superexcited state decay dynamics.
  • To establish techniques analogous to photoelectron spectroscopy and MATI for anions.

Main Methods:

  • Ion pair imaging spectroscopy (IPIS): Utilizes coherent vacuum ultraviolet laser sources and ion imaging to measure fragment kinetic energy above dissociation energy.

Related Experiment Videos

  • Threshold ion pair production spectroscopy (TIPPS): Employs pulsed-field dissociation below the dissociation energy, analogous to MATI.
  • Coherent vacuum ultraviolet laser sources are key for exciting ion pairs.

    • Main Results:

    • IPIS and TIPPS are demonstrated as viable high-resolution techniques for studying ion pair dissociation.
    • These methods allow for detailed investigation of anion behavior analogous to electron behavior in photoelectron spectroscopy.
    • The techniques provide novel insights into the thermochemistry and dynamics of superexcited states.

    Conclusions:

    • Ion pair imaging spectroscopy (IPIS) and threshold ion pair production spectroscopy (TIPPS) represent significant advancements in studying ion dissociation.
    • These novel approaches offer unprecedented resolution for investigating ion thermochemistry and spectroscopy.
    • The developed methods open new avenues for understanding superexcited state decay dynamics.