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Related Experiment Videos

Dynamical angular correlation in molecular Auger decay.

R Guillemin1, E Shigemasa, K Le Guen

  • 1LURE, Université Paris-Sud, 91898 ORSAY Cedex, France. RGuillemin@lbl.gov

Physical Review Letters
|November 3, 2001
PubMed
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Researchers measured Auger electron angular distributions from carbon K-shell ionization in carbon monoxide (CO) molecules. Results reveal spectral variations dependent on molecular orientation and ionization pathways, challenging independent photoionization and Auger decay models.

Area of Science:

  • Molecular physics
  • Atomic and molecular collisions
  • Quantum chemistry

Background:

  • Understanding molecular photoionization dynamics is crucial for chemical reaction mechanisms.
  • Auger electron spectroscopy provides insights into electronic structure and decay pathways.
  • Fixed-in-space molecular targets allow for detailed studies of angular correlations.

Purpose of the Study:

  • To measure the angular distribution of Auger electrons emitted from fixed-in-space CO molecules.
  • To investigate the influence of molecular orientation and ionization channels on Auger electron spectra.
  • To explore the interplay between photoionization and Auger decay processes.

Main Methods:

  • Experimental measurement of Auger electron angular distributions using fixed-in-space molecular beam technique.

Related Experiment Videos

  • Targeted ionization of the C K-shell in CO molecules using synchrotron radiation.
  • Analysis of spectral variations with respect to light polarization and molecular axis orientation.

    • Main Results:

    • First measurements of Auger electron angular distributions from fixed-in-space CO molecules.
    • Observed dramatic spectral variations in the CO(2+)B(1)Sigma Auger final state.
    • Demonstrated dependence of angular distributions on initial ionization channels (Sigma or Pi) and photon energy.

    Conclusions:

    • The observed spectral variations indicate a strong dynamical angular correlation between photoionization and Auger decay.
    • Results challenge the validity of a simple two-step model where these processes are treated independently.
    • Highlights the need for more sophisticated models to describe molecular Auger decay following photoionization.