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Related Experiment Videos

New developments for an electron impact (e,2e)(e,3e) spectrometer with multiangle collection and multicoincidence

F Catoire1, E M Staicu-Casagrande, A Lahmam-Bennani

  • 1Laboratoire des Collisions Atomiques et Moléculaires UMR 8625 and Fédération Lumière Matière, Bâtiment 351, Université de Paris-Sud XI, Orsay Cedex, France. fabrice.catoire@u-psud.fr

The Review of Scientific Instruments
|May 17, 2007
PubMed
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Researchers enhanced an electron spectrometer for triple coincidence detection in electron impact double ionization experiments. This upgrade significantly improves sensitivity for studying electron scattering and ejected electron dynamics.

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Electron impact ionization is crucial for understanding atomic and molecular processes.
  • Previous spectrometers had limitations in detecting multiple electrons simultaneously.
  • High-resolution coincidence spectroscopy is essential for detailed reaction mechanism studies.

Purpose of the Study:

  • To enhance the capabilities and sensitivity of the (e,2e)(e,3e) multicoincidence spectrometer at Orsay University.
  • To enable new classes of experiments previously not feasible due to sensitivity limitations.
  • To improve the detection of three electrons in the final state of electron impact double ionization.

Main Methods:

  • Addition of a third multiangle detection channel for the scattered electron.

Related Experiment Videos

  • Integration of three toroidal electron analyzers with position-sensitive detectors.
  • Comprehensive measurement of angular and energy distributions for ejected and scattered electrons.

    • Main Results:

    • Achieved triple coincidence detection of three electrons in electron impact double ionization.
    • Significant gain in spectrometer sensitivity (approximately 25-fold).
    • Enabled measurements over nearly the entire collision plane and forward scattering angles.

    Conclusions:

    • The upgraded spectrometer uniquely combines three toroidal analyzers for advanced coincidence measurements.
    • The enhanced sensitivity opens up new experimental possibilities in electron-atom/molecule interactions.
    • The system's performance is validated by (e,2e) and (e,3e) experiments on rare gases.