SAMOP 2021 – scientific programme

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A: Fachverband Atomphysik

A 9: Interaction with strong or short laser pulses

A 9.4: Poster

Tuesday, September 21, 2021, 16:30–18:30, P

Strong-field ionization mechanisms of selectively prepared doubly excited states in helium — •Gergana D. Borisova¹, Hannes Lindenblatt¹, Severin Meister¹, Florian Trost¹, Patrizia Schoch¹, Veit Stooß¹, Markus Braune², Rolf Treusch², Harald Redlin², Nora Schirmel², Paul Birk¹, Maximilian Hartmann¹, Christian Ott¹, Robert Moshammer¹, and Thomas Pfeifer¹ — ¹Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Deutschland — ²Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Deutschland

Atomic and molecular systems have one, or a few, energetically lowest ground states but a multitude of excited states, all exhibiting different electron correlation. To gain new insights into the role of the initial state, with its specific electron correlation, for the ionization process, we conducted a two-color extreme ultraviolet (XUV)-infrared (IR) experiment using a reaction microscope (ReMi) to study IR strong-field ionization out of selectively prepared doubly excited states in helium in the XUV energy region between 59 eV and 80 eV, with XUV light provided by the free-electron laser in Hamburg FLASH. Both single- and double-ionization have been observed and the impact of different strong-field ionization mechanisms will be discussed, also in comparison with model calculations.