Abstract
Recent, partly unpublished results obtained with CW high resolution laser-atomic-beam spectroscopy on the 1snp bound Rydberg series of 3,4He and on autoionising 5dnf series of Ba, excited field free as well as in the presence of an electric field, will be reviewed. In the He 1snp series isotope shift, hyperfine structure and linear Stark effect were investigated. Ba 5dnf series show extremely narrow linewidths enabling the first observation of hyperfine structure, isotope shift and resolved angular momentum manifolds in autoionising series.
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