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Related Experiment Videos

Auger electron emission from fixed-in-space CO.

Th Weber1, M Weckenbrock, M Balser

  • 1Institut für Kernphysik, University Frankfurt, August-Euler Strasse 6, D-60486 Frankfurt Germany.

Physical Review Letters
|May 7, 2003
PubMed
Summary

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Researchers studied carbon K-Auger electrons from CO molecules, observing narrow electron ejection towards oxygen and diffraction patterns. The electron

Area of Science:

  • Molecular physics
  • Quantum chemistry
  • Atomic and molecular collisions

Background:

  • Core ionization of molecules like carbon monoxide (CO) leads to complex fragmentation dynamics.
  • Auger electron spectroscopy is a powerful tool for probing electronic structure and molecular fragmentation.

Purpose of the Study:

  • To measure the angular distribution of carbon K-Auger electrons emitted from fixed-in-space CO molecules.
  • To correlate Auger electron emission with the kinetic energy release of fragment ions (C+ and O+).
  • To investigate the influence of final state symmetry on electron angular distributions.

Main Methods:

  • Coincidence measurements of Auger electrons and fragment ions.
  • Fixed-in-space molecular alignment techniques.

Related Experiment Videos

  • Analysis of electron kinetic energy release spectra and angular distributions.

    • Main Results:

    • Observed a highly anisotropic, narrow ejection of carbon K-Auger electrons directed towards the oxygen atom.
    • Identified oscillatory diffraction patterns in the electron angular distributions.
    • Demonstrated a strong dependence of the angular distribution on the symmetry of the final molecular ion states.

    Conclusions:

    • The study reveals detailed insights into the anisotropic nature of Auger electron emission following core ionization of CO.
    • The observed diffraction patterns provide evidence for wave-like electron propagation and interference.
    • Final state symmetry plays a crucial role in determining the dynamics of molecular Auger decay and fragmentation.