Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Atomic systems in external fields
A 5.8: Vortrag
Montag, 23. März 2015, 16:15–16:30, C/kHS
Evolution of very low energy states crossing the ionization threshold in strong mid-infrared fields — •Benjamin Wolter1, Christoph Lemell2, Matthias Baudisch1, Michael G. Pullen1, Xiao-Min Tong3, Arne Senftleben4, Claus Dieter Schröter5, Joachim Ullrich5,6, Robert Moshammer5, Joachim Burgdörfer2, and Jens Biegert1,7 — 1ICFO - Institut de Ciències Fotòniques, Mediterranean Technology Park, Castelldefels (Barcelona), Spain — 2Institute for Theoretical Physics, Vienna University of Technology, Vienna, Austria — 3Center for Computational Sciences, University of Tsukuba, Ibaraki, Japan — 4Universität Kassel, Institut für Physik and CINSaT, Kassel, Germany — 5Max - Planck - Institut für Kernphysik, Heidelberg, Germany — 6Physikalisch - Technische Bundesanstalt, Braunschweig, Germany — 7ICREA - Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
Intense long wavelength (λ≥ 2 µm) laser pulses enable experiments in the tunneling ionization regime (γ ≪ 1) and reveal surprising low electron energy features, which can not be described with the strong-field approximation (SFA). These features, universal for all target species, include the low-energy structure (LES), the very-low-energy structure (VLES) and the zero-energy structure (ZES). Using full 3D electron-ion coincidence detection in combination with our ultrafast 160 kHz mid-IR source, we reveal the entire 3D momentum spectrum well below 1 eV. Quantum and classical simulations allow for an interpretation of the LES, VLES and of the newly identified ZES.