Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.30: Poster

Tuesday, March 6, 2018, 16:15–18:15, Redoutensaal

Transient absorption spectroscopy of the ionization continuum of argon — •Paul Birk, Veit Stooss, Maximilian Hartmann, Alexander Blättermann, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Attosecond transient absorption spectroscopy opens a way to study ultrafast dynamics in excited electronic states of atoms and molecules. The spectral line shapes and their NIR laser-induced changes measured by these experiments carry information about the studied quantum system and originate from the dipole response of bound states. Here, we investigate the response of the ionization continuum. With our all-optical approach, we observed signatures of strong NIR laser-induced coupling between the ionization continuum of argon with its dipole-forbidden excited states. These signatures are compared with the optical response calculated by a numerical multi-level model simulation. This approach enables direct access into the laser-driven strong-field dynamics involving the ionization continuum and spectral dark states.