Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 38: Atoms in Strong Fields II
A 38.1: Vortrag
Freitag, 10. März 2017, 14:30–14:45, N 2
Experimental evidence for Wigner’s tunneling time — •Nicolas Camus1, Enderalp Yakaboylu1,2, Lutz Fechner1, Michael Klaiber1, Martin Laux1, Yonghao Mi1, Karen Z. Hatsagortsyan1, Thomas Pfeifer1, Christoph H. Keitel1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2IST Austria, Am Campus 1, 3400 Klosterneuburg, Austria
Using a reaction microscope the ionization of atoms in elliptically polarized laser pulses at intensities in the tunneling regime and near-IR wavelength of 1300 nm has been investigated. Applying coincident electron-ion detection in combination with a gas-target that contains a mixture of two species (Argon and Krypton) we succeeded in measuring the 3D electron-momentum distributions for both targets under otherwise exactly identical conditions (same spectrometer settings and pulse parameters). A detailed analysis of even faint differences in the electron spectra for Ar and Kr allow a detailed test of theoretical models and, with the help of theory, a sensitive check of the commonly applied separation of the ionization process (tunneling) and the subsequent electron motion in the laser field (electron streaking). The experimental results will be presented and compared to state-of-the-art calculations for strong-field ionization, including additional effects like e.g. focal volume averaging, target depletion, and others. Finally, consequences in view of the ongoing controversial discussion of tunneling times in strong-field ionization will be highlighted [1]. [1] arXiv preprint arXiv:1611.03701 (2016)