Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 21: Interaction with strong or short laser pulses

A 21.11: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Comparison of time-dependent strong-field effects in atoms and molecules observed by attosecond XUV absorption spectroscopy — •Paul Birk, Veit Stooß, Maximilian Hartmann, Alexander Blättermann, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Extreme ultraviolet (XUV) light pulses in the attosecond regime produced by high-harmonic generation of near-infrared (NIR) light are powerful tools to achieve ultra-high time resolution of intra-atomic and -molecular processes. With the help of an all optical approach we get access to bound state dynamics and correlations between electronic states in atoms and molecules. In previous work [1], it was possible to reconstruct and control a time-dependent two-electron wave packet in a measurement of perturbed polarization decay in helium. Based on this work on atoms, we investigate and compare time-dependent strong-field effects in argon and molecular nitrogen by exciting electronic and vibrational states of the target gas by a weak XUV pulse and perturbing the system via a strong NIR pulse. We present first results and interpretations of absorption spectra in the XUV-range and their changes depending on both the time delay and intensity of the strong NIR pulse.

[1] C. Ott, et al., Nature 516, 374-378