Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Posters 3: Cluster, Strong Field Physics, and Experimental Techniques
MO 22.14: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Foyer LLM
Strong-field dynamics of singly excited vibronic resonances in the hydrogen molecule — •Gergana D. Borisova, Veit Stooß, Paul Birk, Maximilian Hartmann, Tobias Heldt, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Deutschland
The effect of strong near-infrared (NIR) laser fields interacting with excited states of the helium atom has been studied with attosecond transient-absorption spectroscopy (ATAS) as well as using electron detection techniques. Looking at molecules, however, not only the electronic but also the nuclear degrees of freedom can be influenced by strong fields. Here, we investigate the dynamics in the presence of a strong NIR laser field in H2, the molecular analogon of the helium atom. In ATAS spectra we resolve a forest of H2 vibronic states in the energy region between 13 and 16.5 eV. Comparing to both theoretical [1] and experimental data [1-3] we assign most of the observed resonances to transitions between the ground state of H2 and higher lying singly excited vibronic states. We observe changes in the XUV absorption spectrum in the presence of moderately strong NIR intensities, INIR∼ 1012 W/cm2. This includes the spectral region of the predissociating D-X system with its vibronic excitations, lying energetically above the first ionization threshold of H2, and thus coupling to continuum states. How the predissociating character of the D-X transitions is imprinted on the absorption spectrum and the laser control of the initiated dynamics is the main subject of this work. [1] Can. J. Phys. 72, 856 (1994) [2] PRA 94, 023403 (2016) [3] PRA 97, 023401 (2018)