# Hannover 2013 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 45: Atomic systems in external fields I

### A 45.2: Vortrag

### Freitag, 22. März 2013, 11:30–11:45, B 302

**Strong-field response of a system with resonance in the continuum.** — •Maria Tudorovskaya and Manfred Lein — Institut für Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany

If an atom is subject to a strong oscillating field, it can emit high-harmonic radiation due to the ionization and the following recombination. We consider high-harmonic generation (HHG) in a system with a metastable resonance state in the continuum.

We solve the time-dependent Schrödinger equation numerically in 1D and 2D. We consider a model system describing ions in a Mn plasma [1]. In the system, noticeable increase of HHG at frequencies around the resonance is found. For few-cycle driving pulses, emission takes the form of a short burst.

With an additional XUV driving field, Rabi oscillations can be induced between the ground state and the resonance, affecting the resulting spectrum. Because the decay of the resonance, the oscillation amplitude is damped. Due to the combined effect of the fields, the intensity of the harmonics in the plateau region can be significantly increased.

[1] R. A. Ganeev, et al., Opt. Express 20, 25239 (2012).