Abstract
Using resonance ionization spectroscopy the first-ionization potential of actinium has been determined by analyzing different Rydberg series in two-color resonant laser excitation. Three individual Rydberg series were investigated, converging toward the ionic ground state and toward the first- and second-excited state of the actinium ion, respectively. A combined analysis of the convergence limits leads to a consistent value for the first-ionization potential of Ac of , equivalent to eV.
- Received 19 December 2011
DOI:https://doi.org/10.1103/PhysRevA.85.012525
©2012 American Physical Society