Phys. Rev. Lett. 81, 2442–2445 (1998)Spectral Properties of Nonhydrogenic Atoms in Weak External FieldsReceived 7 April 1998; published in the issue dated 21 September 1998 We study how the ionic core in a nonhydrogenic atom modifies the dynamics of a Rydberg electron in the presence of a weak static external field. We show that such a system is neither regular nor chaotic: its energy levels display unusual statistical properties, intermediate between the standard Poisson and random matrix ones. The ionic core acts as a scatterer whose size is comparable to the de Broglie wavelength of the electron, inducing specific quantum effects. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2442
DOI:
10.1103/PhysRevLett.81.2442
PACS:
32.60.+i, 05.45.+b, 03.65.Sq, 32.80.Rm
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