Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.37: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Precision investigation of the momentum distribution after strong-field ionization — •Ingo Dreissigacker and Manfred Lein — Institut für Theoretische Physik and Centre for Quantum-Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover

Motivated by recent experimental progress in precision investigation of strong-field ionization by angular streaking [1] and velocity-map imaging [2], we employ linearly polarized half-cycle laser pulses to investigate the ionization process theoretically. Momentum distributions are calculated by numerical solution of the time-dependent Schrödinger equation for the hydrogen atom. For moderate intensities, the results support the picture that ionization occurs most probably at the peak of the field, without tunnelling delay time. The lateral width of the momentum distribution is in good agreement with tunnelling theory. Furthermore we find that the lateral width is maximum for electrons born near the peak of the field, even at high intensities for which the peak of the momentum distribution does not correspond to ionization at the peak of the field.
[1] Eckle et al., Science 322, 1525 (2008).
[2] Arissian et al., Phys. Rev. Lett. 105, 133002 (2010).