Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 10: Atomic systems in external fields

A 10.7: Talk

Monday, March 17, 2014, 15:45–16:00, BEBEL E44/46

Observation of a stability island in the high energy (E > 0) region of the hydrogen atom in crossed electric and magnetic fields — •Frank Schweiner, Jörg Main, and Günter Wunner — 1. Institut für Theoretische Physik, 70550 Stuttgart, Germany

The spectra of the crossed fields hydrogen atom at energies slightly above the Stark saddle point are influenced by unstable periodic orbits surrounding the saddle point. Following those periodic orbits to very high energies far above E=0 we demonstrate that different types of bifurcations between the orbits appear. For specific values of the energy and field strengths the orbits become stable, which is related to the formation of a stability island in phase space. The bifurcation scenario is analyzed. The possible existence of narrow resonances obtained by semiclassical quantization of the stable orbits is discussed.