Abstract
Ionic Rydberg energy levels of lanthanum are calculated from firstprinciples by relativistic multichannel theory within the framework ofmultichannel quantum defect theory. The present calculated results arein better agreement with the experimental measurements than theprevious calculations [J. Phys. B 34 (2001) 369] due to theconsideration of dynamical polarizations. Moreover, in the experimentalspectra achieved by a five-laser resonance excitation via theintermediate state 5d6d3 F2, a seriesof weak ionic Rydberg states and some of perturbing states are foundand assigned in this work.
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