Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Poster II
A 34.42: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Non-sequential Double Ionization of Neon and Argon below the Recollision Threshold — Yunquan Liu1, Sebastian Tschuch1, Artem Rudenko2, Martin Dürr1, Uwe Morgner3, •Bettina Fischer1, Manuel Kremer1, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Max-Planck Advanced Study Group within CFEL, Notkestrasse 85, 22607 Hamburg, Germany — 3Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
Kinematically complete experiments for single and double ionization of argon and neon in ultra-short (28 fs) laser pulses (800 nm) at intensities below and close to the classical recollision threshold for non-sequential double ionization are presented. In contrast to high intensity results we observe a dominant back-to-back emission of both electrons for double ionization of Ar below the threshold. The relationship between single and double ionization is discussed and the fundamental question of double ionization in strong laser fields is addressed. The transverse momentum distributions of electrons provide new insights into the role of the so-called Coulomb focusing effect.