Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 32: Interaction with strong or short laser pulses III

A 32.3: Talk

Thursday, March 26, 2015, 15:15–15:30, C/HSW

Quantum oscillations between close-by states mediated by the electronic continuum in intense high-frequency pulses — •Philipp V Demekhin¹ and Lorenz S Cederbaum² — ¹Institut für Physik, Universität Kassel, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany — ²Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany

The dynamics of neighboring states exposed to short intense laser pulses of carrier frequencies well above the ionization threshold of the system is investigated from first principles. It is shown that the pulse induces a time-dependent non-hermitian coupling between these states determined by the AC Stark effect in the electronic continuum and the direct ionization probability. This coupling induces quantum oscillations between the neighboring states while the strong pulse is on. The phenomenon opens the possibility to achieve a coherent control over the populations of neighboring states by strongly off-resonant ionizing pulses. Numerical exemplifications of the present analytical results suggest exciting applications for experiments.