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A: Fachverband Atomphysik
A 3: XUV/X-ray spectroscopy I
A 3.5: Vortrag
Montag, 6. März 2017, 15:45–16:00, N 2
Auger cascades in resonantly excited neon — •Sebastian Stock1,2, Randolf Beerwerth1,2, and Stephan Fritzsche1,2 — 1Helmholtz-Institut Jena, 07743 Jena, Germany — 2Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
Auger electron spectroscopy is an important tool for probing the inner-shell structure of atoms and ions. Over the past few decades, multi-electron coincidence spectroscopy has led to substantial progress in our understanding of multiple ionization via Auger processes.
We here present a theoretical study [1] of the Auger decay paths following resonant 1s→ np (n=3,4) excitation of neutral neon. In contrast to the usual approach that often considers just a few transitions, we model the complete cascade decay paths from neutral to doubly ionized neon. By performing extensive MCDF calculations, we include the effects of electron correlation in the calculation of the transition rates of many possible decays. In addition, we also account for shake processes, which play a significant role in some of these transitions. In order to improve our results, especially for low-energy transitions, we employ experimental values for the energy levels of neutral, singly and doubly ionized neon.
By modeling the complete cascade, we are able to predict electron spectra, shake probabilities, ion yields, and the population of intermediate and final states. Our results are in good agreement with experimental findings, e.g. from Ref. [2].
[1] S. Stock, R. Beerwerth, and S. Fritzsche, to be published.
[2] Y. Tamenori and I. H. Suzuki, J. Phys. B 47, 145001 (2014).