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Frankfurt 2006 – scientific programme

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A: Atomphysik

A 22: Poster II: Photoionisation

A 22.11: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Quantum signatures of chaos in doubly excited helium — •Y. Jiang1, R. Püttner1, D. Delande2, M. Martins3, and G. Kaindl11Freie Universität Berlin, D-14195, Berlin — 2Laboratoire Kastler-Brossel Tour 12, Universite Pierre et Marie Curie, F-75252 Paris Cedex 05, France — 3Universität Hamburg, D-22761, Hamburg

Recent studies of doubly excited helium below the ionization threshold (SIT) I9 of He+ showed a transition to quantum chaos by analyzing the nearest neighbor spacing distribution [1]. Present measurements in the energy region up to the SIT I15 of He+ were performed, which show excellent agreement with state-of-the-art complex-rotation calculations. Based on the calculations the spectral features were assigned and no indication of Ericson fluctuations were found. Using the theoretical results we studied the approximate quantum numbers as well as the statistical properties of energy levels, linewidths, and Fano parameters q. Preliminary statistical analysis displayed interesting precursor signatures of quantum chaos in doubly excited helium. This studies prove for the first time the transition region from integrability to chaos to be much larger than expected before since the quantum number K dissolves rather slowly.
Reference: [1] R. Püttner et al., Phys. Rev. Lett. 86, 3747 (2001).

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