Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 25: Attosecond physics

A 25.7: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

Continuum dynamics of Helium in intense laser fields — •Tobias Heldt, Paul Birk, Gergana D. Borisova, Maximilian Hartmann, Veit Stooß, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany

We investigate electron dynamics in strong near-infrared laser fields on an attosecond time scale. Experimentally this is done by attosecond transient-absorption spectroscopy of different targets, e.g. on the benchmark-system helium.

In this work, we analyze which parameters modify observed features in the measured helium absorption spectrum close to and above the single ionization threshold. The helium atom is modelled in the single active electron and the dipole approximation on a discrete 1D grid. Its electron dynamics is examined by solving the time-dependent Schrödinger equation with an ab initio simulation taking into account the Coulomb potential and the laser field. We observe time-dependent electron dynamics below and above the ionization threshold on a sub-cycle time scale.