Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Time-resolved spectroscopy
A 6.3: Vortrag
Montag, 6. März 2017, 18:00–18:15, HS 20
Using strong-field spectroscopy to observe the ultrafast buildup of a Fano resonance — •Veit Stooß1, Alexander Blättermann1, Andreas Kaldun1, Stefan Donsa2, Hui Wei3, Renate Pazourek2, Stefan Nagele2, Christian Ott1, Chii-Dong Lin3, Joachim Burgdörfer2, and Thomas Pfeifer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany, EU — 2Institute for Theoretical Physics, Vienna University of Technology, Vienna, Austria, EU — 3Department of Physics, Kansas State University, Manhattan, USA
High-harmonic generation and the resulting attosecond light pulses in the extreme ultraviolet (XUV) spectral range enables access to the dynamics of electrons in atomic and molecular systems. The method of strong-field spectroscopy uses these pulses to excite bound electronic states, which are subsequently perturbed in their natural evolution with a high-intensity ultrashort near-infrared (NIR) pulse. By observing the thus modified XUV absorption spectrum one gains insights into such strong-field-driven dynamics. Here, we use this method to create a controllable temporal gate between excitation and termination of a bound-bound transition to experimentally observe the emergence of an asymmetric Fano absorption resonance in helium [1]. The results shown are in good agreement with ab-initio calculations as well as analytical models describing the buildup of a Fano resonance.
[1] Observing the ultrafast buildup of a Fano resonance in the time domain - Science, Vol. 354, Issue 6313, pp. 738-741 (2016)