SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Atomic Systems in External Fields
A 10.5: Vortrag
Dienstag, 7. März 2023, 12:15–12:30, F107
The Auger electron knows if the photoelectron met another atom — •Andreas Hans1, Niklas Golchert1, Emilia Heikura1, Nils Kiefer1, Lutz Marder1, Catmarna Küstner-Wetekam1, Johannes Viehmann1, Jerome Palaudoux2, Francis Penent2, and Arno Ehresmann1 — 1Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Sorbonné Universite, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR, F-75005 Paris Cedex 05, France
Auger spectroscopy is a powerful and omnipresent method in both fundamental research and applied science. Generally, in a two-step model the Auger process is regarded to be independent from the initial photoionization event. Only for very low excess energies of the photoelectron, the electrons need to be considered to be correlated through the so-called post collision interaction (PCI). Here we demonstrate that this picture fails if an atom is located in an environment the photoelectron can interact with. In particular, a Coulomb contribution needs to be subtracted from the Auger electron's kinetic energy if the photoelectron created charged atoms nearby by electron-impact ionization.