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Rechercher
Explicit analysis of chaotic behavior in radial and angular motion in doubly excited helium
Y. H. Jiang, R. Puettner, D. Delande, M. Martins and G. Kaindl
Phys. Rev. A. 78, 021401 (2008)
Experimental and theoretical total photoionization cross sections of doubly
excited He up to the single
ionization threshold 
of He
are presented,
revealing excellent agreement. All spectra are dominated by principal
Rydberg series, what is explained by the observation that the quantity F = N - K
is approximately a good
quantum number for a large fraction of states.
The statistical distributions of nearest-neighbor energy spacings between resonances
of Rydberg series with small F approach a Wigner distribution.
The results show no indication for a transition to full chaos - i.e. a
loss of all approximate quantum numbers - in He.
