Abstract
Photoelectron measurements have been carried out with three different sources of synchrotron radiation for studying photoexcitation and autoionization of hollow lithium atoms. The comparison of the three sets of data demonstrate the need of a third generation storage ring for a better understanding of atomic structures and dynamical photoionization processes of atomic systems. Partial cross sections have been measured with high spectral resolution at ALS, for hollow atoms formed by triple excitation of lithium atoms in the ground- or first optically excited states, providing the first definitive test of advanced ab initio calculations for this highly excited four-body atomic system. The existence of Rydberg series within the many observed hollow lithium states is demonstrated.
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