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Oscillations due to two-electron exchange during He-Ne collisions

Planje1, Westerveld, Niehaus

  • 1Debye Institute, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.

Physical Review Letters
|September 16, 2000
PubMed
Summary

Electron spectra from Helium-Neon collisions reveal oscillating peaks for Ne(-) and He(-). This antiphase oscillation suggests a simultaneous two-electron "hopping" mechanism in quasiresonant states.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Collision Spectroscopy

Background:

  • Autodetachment peaks in electron spectra provide insights into electron behavior in atomic collisions.
  • Understanding electron dynamics in ion-atom collisions is crucial for fundamental physics.
  • Previous studies have explored electron detachment in various collision systems.

Purpose of the Study:

  • To investigate the autodetachment peaks of Ne(-) and He(-) in Helium-Neon (He-Ne) collisions.
  • To analyze the oscillatory behavior of these peaks as a function of collision energy.
  • To elucidate the underlying mechanism responsible for the observed oscillations.

Main Methods:

  • Experimental measurement of electron spectra from He-Ne collisions.

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  • Energy range studied: 350 eV to 6 keV.
  • Analysis of the areas of Ne(-) and He(-) autodetachment peaks.

    • Main Results:

    • Observed oscillation in the areas of Ne(-) and He(-) autodetachment peaks.
    • Peaks oscillate in approximate antiphase with a constant wavelength on a (velocity)(-1) scale.
    • The behavior is attributed to a quasiresonance situation in separating Ne(-)-He(+) and He(-)-Ne(+) channels.

    Conclusions:

    • The observed antiphase oscillations are explained by a simultaneous two-electron 'hopping' mechanism.
    • The quasiresonance model successfully describes the electron dynamics in He-Ne collisions.
    • This study provides a deeper understanding of electron correlation and detachment processes in atomic collisions.