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A: Fachverband Atomphysik

A 3: Interaction with strong or short laser pulses I

A 3.4: Talk

Monday, March 17, 2014, 11:15–11:30, BEBEL E44/46

Rydberg state distribution of neutral Helium atoms after frustrated tunneling ionization (FTI) — •Henri Zimmermann, Sebastian Eilzer, and Ulli Eichmann — Max-Born-Institut for Nonlinear Optics und Short Pulse Spectroscopy, Berlin, Germany

Excitation of neutral atoms by short intense laser pulses through the process of frustrated tunneling ionization (FTI) has been found to be one of the four dominant processes in the tunneling regime of strong-field ionization. Several numerical methods ranging from classical to fully correlated quantum mechanical calculations have been used for the prediction of the excited state distribution generated by this process but so far an experimental investigation is still missing. Here, we present the first experimental confirmation of the theoretical predictions for the surviving neutral atoms for Helium. Furthermore we show the presence of laser induced spin dynamics upon excitation as well as the possibility of their modification.