Abstract
We present the experimental evidence for a few elementary processes occurring in Stark effect for non-hydrogenic atoms. They are likely to play an important role in the field redistribution of non-hydrogenic states onto the parabolic hydrogenic channels. We only consider the low field quasi-bound part of the spectra. We show in particular that the interaction between non-hydrogenic states and the incomplete hydrogenic manifold (exhibiting a linear Stark behaviour) leads to the generation of quasi-Fano interference profiles well described in the framework of “interaction of one discrete state with a quasi-continuum of discrete states”. Some examples of accidental decoupling of states from the manifold are also shown leading to peculiar features throughout the spectrum.
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