Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 3: Interaction with strong or short laser pulses I

A 3.1: Vortrag

Montag, 17. März 2014, 10:30–10:45, BEBEL E44/46

Describing the phase of a tunneling electron wave packet by interference with an XUV electron — •Jost Henkel and Manfred Lein — Institut für Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover Appelstraße 2, 30167 Hannover, Germany

The interference pattern in the photoelectron momentum distribution created by ionization from an IR field and an XUV pulse encodes information about the phases for both ionization processes. Assuming knowledge of the XUV single-photon ionization properties, the interference pattern could provide access to the photoelectron phase in IR ionization. By comparing numerical and analytical solutions of the strong-field approximation (SFA) to numerical solutions of the time-dependent Schrödinger equation (TDSE) for the IR ionization process we can identify additional phase contributions not contained in the SFA. These phase shifts are caused by the core potential or Stark shifting of the ground state during ionization.