Influence of Increasing Nuclear Charge on the Rydberg Spectra of Xe,Cs+, andBa++: Correlation, Term Dependence, and Autoionization

Abstract
The first experimental-theoretical study of Rydberg autoionizing resonances along an isoelectronic sequence is presented. This analysis demonstrates the intimate connection between electron-electron correlation, term dependence, and autoionization and underscores the power of multichannel quantum-defect theory in analyzing complex spectra.