Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 7: Poster I

A 7.11: Poster

Monday, March 14, 2011, 16:00–18:30, P1

Strong-field laser atom interaction: dynamic resonances and laser-induced states — •Thomas Keil and Dieter Bauer — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

During the interaction of strong laser fields with atoms, energy levels undergo pronounced nonperturbative AC Stark shifts. It is known, for instance, that Rydberg levels may be brought into multiphoton resonances for particular laser field intensities (Freeman resonances). Such resonances give rise to a nonmonotonic behavior of the ionization rate as a function of the laser intensity. The laser field may also induce bound states that are absent without laser field. If populated, light-induced states are useful for the understanding of unexpected observations such as even harmonics from systems with inversion symmetry. We present photoelectron spectra obtained from the ab initio solution of the time-dependent Schrödinger equation and identify effects of Freeman resonances on them. Light-induced states are investigated via a spectral analysis of the ab initio wavefunction.