Abstract
Intrashell transitions in Rydberg atoms with a nonhydrogenic core were studied. The degeneracy of the energy shell was lifted by constant electric and magnetic fields and transitions from initial coherent elliptic states (CES) were driven by a harmonic electric field. Evenly spaced hydrogenic resonances dominate at low eccentricities $e$ of the CES. At high $e$, the hydrogenic structures disappear and new structures of a more irregular nature emerge. Classical and quantal calculations are described and are shown to agree fairly well with the experiment. Further, the classical calculations suggest that many of the observed phenomena are a consequence of the underlying classical dynamics being chaotic.
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