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Statistical properties of inter-series mixing in helium: from integrability to chaos
R Püttner1, B Grémaud, D Delande
1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin-Dahlem, Germany.
Physical Review Letters
|May 1, 2001
Abstract:
The photoionization spectrum of helium shows considerable complexity close to the double-ionization threshold. By analyzing the results from both our recent experiments and ab initio three- and one-dimensional calculations, we show that the statistical properties of the spacings between neighboring energy levels clearly display a transition towards quantum chaos.