Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 18: Interaction with strong or short laser pulses I
A 18.8: Vortrag
Mittwoch, 16. März 2011, 18:15–18:30, BAR 106
Ionization of atoms by strong infrared fields: Solution of the time-dependent Schrödinger equation in momentum space for a model based on separable potentials — Hugues Tetchou Nganso1,2, Yuri Popov3, Bernard Piraux1, •Javier Madroñero4, and Moïse Godfroy Kwato Njock2 — 1Université Catholique de Louvain, Belgium — 2University of Douala, Cameroon — 3Moscow State University, Russia — 4Technische Universität München, Germany
We consider the ionization of atomic hydrogen by a strong infrared field. By starting from the corresponding time-dependent Schrödinger equation in momentum space, we develop a model in which the kernel of the non-local Coulomb potential is replaced by a finite sum of separable potentials. Each separable potential supports one bound state of atomic hydrogen. Here, we consider only the 1s, 2s and 2p states. In this way, the full 3-dimensional Schrödinger equation reduces to a system of a few coupled 1-dimensional linear Volterra integral equations. This model is a theoretical tool to understand the actual role of the atomic potential in the intensity regime where tunnel ionization is supposed to take place and where the experimental data for the first ATI peaks are in contradiction with the theoretical predictions based on the strong field approximation model.