Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 12: Posters: Interaction with intense laser pulses
A 12.13: Poster
Tuesday, March 11, 2008, 16:30–18:30, Poster C3
Correlated Two-Electron Momentum Spectra for Strong-Field Non-Sequential Double Ionization — Artem Rudenko1, Vitor de Jesus2, •Thorsten Ergler1, Karl Zrost1, Bernold Feuerstein1, Manuel Kremer1, Bettina Fischer1, Claus Dieter Schröter1, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Centro Federal de Educação Tecnológica de Química de Nilópolis/RJ, Rio de Janeiro, Brazil
Non-sequential double ionization (NSDI) of atoms by intense linearly polarized laser fields has remained one of the central and most controversial topics in strong-field physics for more than two decades. Though most of the experimental findings are in good overall agreement with a semiclassical "recollision" model, the current understanding of NSDI is far from being complete. Here we present the results of a kinematically complete experiment on NSDI of He by 800 nm 25 fs 1.5 PW/cm^2 laser pulses. In contrast to earlier experimental results for Ne and Ar, we observe a pronounced v-shaped structure in the two-electron momentum distributions along the laser polarization ("longitudinal") direction, which was predicted by several S-matrix calculations, and by the numerical solutions of the time-dependent Schrödinger equation. This pattern, indicating that both electrons have non-equal longitudinal momenta in the final state, can be explained by the role of the Coulomb repulsion and typical (e,2e) recollision kinematics.