Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 42: Poster: Attosecond physics

A 42.1: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Correlated Few-Electron Dynamics on the Attosecond Timescale — •Thomas Ding, Christian Ott, Andreas Kaldun, Alexander Blättermann, Difa Ye, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany

The concerted motion of two or more electrons is the fundamental cause of virtually any chemical reaction. With attosecond laser pulses, a time-resolved investigation of the correlated electron dynamics on their natural timescales is possible. In a recent experiment we induced a coherent wavepacket beating of several doubly-excited states (DES) in helium with weak broadband attosecond-pulsed light in the extreme ultraviolet (XUV) energy range. We studied the behavior of the DES under the influence of a strong few-cycle near-infrared (NIR) dressing field allowing the coherent coupling of the DES with the N = 2 threshold. The time-delay of the XUV pulse with respect to the NIR dressing field as well as the laser intensity of the latter are varied and serve as control parameters in this setup. In more recent experiments other rare gas species such as neon are investigated, which will be presented here. In addition, for a better understanding of the role of electron correlation, we reproduce our experimental conditions theoretically in a one-dimensional two-electron model system that interacts with the corresponding laser pulses. By numerically solving the time-dependent Schrödinger equation we calculate the XUV absorption cross section and obtain results that are qualitatively consistent with our experiments. The simulations allow a direct visualization of the induced and controlled correlated two-electron wavefunction dynamics.