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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.35: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

The Effect of Electron Correlation on the Ionisation of Helium in Strong and Short Laser Pulses — •Gergana Borisova, Veit Stooß, Andreas Fischer, Alexander Blättermann, Thomas Ding, Andreas Kaldun, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Here, we present theoretical results from our study of the electron dynamics in the helium atom interacting with strong laser fields (XUV-excitation and NIR-perturbing pulse) on the attosecond timescale.
We investigate the role of electron-electron correlation dynamics to explain the experimentally observed abrupt ionisation of N = 2 doubly excited states in helium above a certain critical NIR-laser intensity. For this we employ a numerical quantum-mechanical model based on solving the one-dimensional time-dependent Schrödinger equation for two electrons. The theoretical method ensures direct access to the time-dependent population of the relevant atomic states during and right after the laser pulse. The simulation results obtained confirm our experimental observations and give important clues to the role of the electron-electron interaction in the ionisation processes.