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A: Fachverband Atomphysik

A 26: Poster III

A 26.19: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Differential cross sections for non-sequential double ionization of He by 52 eV photons from FLASH — •Moritz Kurka^1,2, Artem Rudenko^2,1, Yuhai Jiang¹, Lutz Foucar^2,1, Oliver Herrwerth³, Matthias Kling³, Claus Dieter Schröter¹, Robert Moshammer¹, and Joachim Ullrich^1,2 — ¹Max-Planck Institut für Kernphysik, 69117 Heidelberg — ²Max-Planck Advanced Study Group at CFEL, 22607 Hamburg — ³Max-Planck Institut für Quantenoptik, 85748 Garching

We present the results of recent measurements at the free-electron laser Hamburg (FLASH) on two-photon double ionization of helium at a photon energy of 52 eV. Inspecting the momentum distribution of He²⁺ ions we find first experimental evidence for an effect termed ’virtual sequential ionization’ recently predicted in theoretical calculations [1]. Comparing our experimental data with state-of-the-art calculations solving the time-dependent Schrödinger equation we find good overall agreement except for cuts along the polarization direction, where we exhibit a siginifcant shift towards larger momenta [2]. [1] D.A. Horner et al., PRA 76, 030701 (2007). [2] M.Kurka et al., NJP 12, 073035(2010).