Interference and stabilization in the quasibound Stark spectrum

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Abstract
Experimental studies of the quasibound Stark spectrum of cesium are reported with emphasis on the Stark redistribution of nonhydrogenic states onto the linear Stark manifold. We show that most characteristics of the spectra are understood with analytical models describing the interaction of one or several discrete states with one or several quasicontinua of discrete states. In particular, we give experimental evidence for the discrete versions of Fano profiles and stabilization of states due to interference effects. These are also important features of the continuum region which several experiments have recently demonstrated.