Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 18: Interaction with strong or short laser pulses I
A 18.3: Vortrag
Mittwoch, 16. März 2011, 17:00–17:15, BAR 106
Low-Energy Structures in Strong Field Ionization Revealed by Quantum Orbits — •Tian-Min Yan1, 2, Sergey Popruzhenko3, Marc Vrakking4, 5, and Dieter Bauer1 — 1Institut für Physik, Universität Rostock, 18051 Rostock, Germany — 2Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany — 3National Research Nuclear University "Moscow Engineering Physics Institute", Kashirskoe Shosse 31, 115409, Moscow, Russia — 4FOM-Institute AMOLF, Science Park 113, 1098 XG Amsterdam, The Netherlands — 5Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin, Germany
Experiments on atoms in intense laser pulses and the corresponding exact ab initio solutions of the time-dependent Schrödinger equation (TDSE) yield photoelectronic spectra with low-energy features that are not reproduced by the otherwise successful work horse of strong field laser physics: the "strong field approximation" (SFA). In the semi-classical limit, the SFA possesses an appealing interpretation in terms of interfering quantum trajectories. It is shown [1] that a conceptually simple extension towards the inclusion of Coulomb effects yields very good agreement with exact TDSE results. Moreover, the Coulomb quantum orbits allow for a physically intuitive interpretation and detailed analysis of all low-energy features in the semi-classical regime, in particular the recently discovered "low-energy structure" [2,3].
[1] Tian-Min Yan, S.V. Popruzhenko, M.J.J. Vrakking, D.Bauer, Phys. Rev. Lett. (in press). [2] C.I. Blaga et al., Nature Physics 5, 335 (2009). [3] W. Quan et al., Phys. Rev. Lett. 103, 093001 (2009).