Abstract
In alkaline-earth atoms strong perturbations in sequences of highly excited (Rydberg) states occur due to interaction with low-lying valence states of series converging to a higher ionization limit. Multi-channel quantum-defect theory (MQDT) has been used to describe the energy-level structure. Configuration mixing not only affects the level positions but is also reflected in the radiative properties, in the Zeeman and Stark effects and in the hyperfine structure, and measurements of these phenomena can serve for sensitive probing of the mixing of wavefunctions.
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