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A: Fachverband Atomphysik
A 20: Poster Session I
A 20.31: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1
Shake-up Processes in Auger Cascades of Light and Medium Elements — •Randolf Beerwerth1,2 and Stephan Fritzsche1,2 — 1Helmholtz Institut Jena, Fröbelstieg 3, 07743 Jena, Germany — 2Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
In recent years, coincidence spectroscopy of photo and Auger electrons helped to investigate the de-excitation of atoms, molecules and solids after the creation of inner shell holes. The kinetic energies of the emitted electrons allow to obtain information not only about the spectrum and population of the final states, but also about the decay pathways of an Auger cascade.
Our studies reveal that many Auger cascades are strongly affected by shake-up (or down) transitions, in which the two-electron Auger process is accompanied by an additional (de-)excitation of a valence electron. For example, in the de-excitation of resonantly excited negative oxygen ions [1], complex electron correlation effects lead to a strong contribution of shake transitions to the total decay width. Furthermore, the population of higher lying intermediate states also enables the occurrence of three-step Auger cascade decays that are otherwise not possible due to energetic reasons.
We will discuss the effects of shake-up transitions on Auger cascades of different elements and the theoretical models that are needed to account for the underlying electron correlation effects.
[1] S. Schippers et al., Phys. Rev. A 94, 041401 (2016).