Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 10: Interaction with strong or short laser pulses II

A 10.1: Talk

Monday, March 12, 2012, 16:30–16:45, V55.01

Above threshold ionization of atomic hydrogen by an IR pulse using the time-scaled coordinate approach — •Johannes Eiglsperger¹, Ana Laura Frapiccini², Aliou Hamido², Javier Madroñero³, Francisca Mota-Furtado⁴, Patrick O’Mahony⁴, and Bernard Piraux² — ¹Universität Regensburg, Germany — ²Université catholique de Louvain, Berlgium — ³Technische Universität München, Germany — ⁴University of London, UK

The development of intense, ultrafast laser sources in the mid infrared (IR) region provides new opportunities in strong-filed physics. In recent experiments to study the electronic dynamics of atoms and molecules on time scale of the electronic motion, these sources play an essential role. Deep understanding of the IR-electron interaction poses a challenge: the simple semi-classical recollision model allows to understand basic mechanisms, the use of the strong field approximation is dubious, and currently available techniques for the solution of associated time-dependent Schrödinger equation are not efficient enough. In this contribution, we study the above threshold ionization spectrum resulting from the interaction of H with an intense very low frequency field. We draw our attention to the low-energy part of the spectrum and discuss the possible role of tunneling in this process. For that purpose, we use a highly efficient ab initio approach for solving the time-dependent Schrödinger equation which combines a high-order time propagator based on a parallelizable predictor-corrector scheme with the time-scaled coordinate method [1].

[1] A. Hamido et al., Phys. Rev. A 84, 013422 (2011).