Statistical properties of inter-series mixing in helium: from integrability to chaos.
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.
Püttner
R
R
Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin-Dahlem, Germany.
Grémaud
B
B
Delande
D
D
Domke
M
M
Martins
M
M
Schlachter
A S
AS
Kaindl
G
G