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Related Experiment Videos

Thermally stimulated exoelectron emission from solid neon.

Marcin Frankowski1, Elena V Savchenko, Alice M Smith-Gicklhorn

  • 1Institut fur Physikalische und Theoretische Chemie, Technische Universitat Munchen, Lichtenbergstrasse 4, Garching 85747, Germany. frankowski@ch.tum.de

The Journal of Chemical Physics
|July 21, 2004
PubMed
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Electrons can be trapped in solid neon, even with its negative electron affinity. Annealing experiments reveal distinct electron trapping sites and their energy levels, detected via exoelectron emission.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Low-Temperature Physics

Background:

  • Neon atoms exhibit negative electron affinity, posing challenges for electron trapping.
  • Solid neon layers can trap significant electron concentrations at defect sites.
  • Electron irradiation during deposition is key to forming these trapped states.

Purpose of the Study:

  • Investigate electron trapping mechanisms in solid neon.
  • Characterize the energy distributions of trapped electrons.
  • Correlate experimental findings with theoretical predictions of electronic defect formation.

Main Methods:

  • Formation of solid neon layers via gas deposition on a cold substrate.
  • Concurrent electron irradiation during deposition.

Related Experiment Videos

  • Annealing experiments to promote trapped electrons.
  • Detection of thermally stimulated exoelectron emission (TSEE).

    • Main Results:

    • Two distinct features in the exoelectron emission profile near 7.5 K and 10 K were observed.
    • These features correspond to two distributions of electron trapping sites.
    • An average activation energy of approximately 23 meV was determined for the higher-temperature feature.

    Conclusions:

    • Solid neon can effectively trap electrons at defect sites, despite its inherent negative electron affinity.
    • Thermally stimulated exoelectron emission provides a method to probe these trapping sites.
    • The deduced activation energies align with theoretical models for electronic defect formation in solids.