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Related Experiment Videos

Electron scattering on OH-(H2O)n clusters (n = 0-4).

A Svendsen1, H Bluhme, K Seiersen

  • 1Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark.

The Journal of Chemical Physics
|August 31, 2004
PubMed
Summary

Electron scattering cross sections on hydrated hydroxide ions (OH-(H2O)n) were measured. Hydration increased detachment threshold energy, and resonances were observed in larger clusters, indicating dianion formation.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Atomic and Molecular Physics

Background:

  • Understanding electron-molecule interactions is crucial in various chemical and physical processes.
  • Hydration significantly influences the properties of ions, affecting their reactivity and stability.
  • Previous theoretical models predicted certain behaviors for electron detachment processes.

Purpose of the Study:

  • To experimentally measure electron scattering cross sections for hydrated hydroxide ions (OH-(H2O)n) for n=0-4.
  • To investigate the effect of sequential hydration on electron detachment threshold energies.
  • To identify and characterize any resonant structures in the electron scattering cross sections.

Main Methods:

  • Experimental measurement of electron scattering cross sections using a crossed-beam apparatus.

Related Experiment Videos

  • Varying the incident electron energy from the detachment threshold up to approximately 50 eV.
  • Analysis of detachment and dissociation channels following electron impact.

    • Main Results:

    • Electron detachment cross sections followed classical predictions, with threshold energies increasing with hydration (4.5 eV for OH- to 12.1 eV for OH-(H2O)4).
    • For n >= 1, approximately 80% of events resulted in electron detachment and cluster dissociation.
    • Resonances were observed around 15 eV for OH-(H2O)3 and OH-(H2O)4, attributed to excited dianion formation.

    Conclusions:

    • Sequential hydration systematically increases the electron detachment threshold energy for hydroxide clusters.
    • Electron-impact dissociation is a dominant process for hydrated hydroxide ions.
    • Observed resonances provide evidence for the transient formation of excited dianionic states in larger hydrated clusters.