Abstract
We have investigated level statistics in constant-scaled-energy spectra of the diamagnetic helium atom. In a transversely laser-cooled beam metastable triplet atoms are excited to Rydberg states in the presence of a magnetic field, resolving all resonances. In the regime of regular classical motion level distributions obeying Poisson statistics are observed. Small deviations are attributed to scattering at the nonhydrogenic $\mathrm{He}{}^{+}$ core as inferred from closed-orbit theory. The nearest-neighbor spacings in spectra in the chaotic regime demonstrate a clear shift towards Wigner statistics.
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