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Two lowest-energy odd-parity atomic levels of actinium, 7s^27p 2P^o_1/2,7s^27p 2P^o_3/2, were observed via two-step resonant laser-ionizationspectroscopy and their respective energies were measured to be 7477.36(4) cm^-1and 12 276.59(2) cm^-1. The lifetimes of these states were determined as668(11) ns and 255(7) ns, respectively. In addition, these properties werecalculated using a hybrid approach that combines configuration interaction andcoupled-cluster methods in good agreement. The data are of relevance forunderstanding the complex atomic spectra of actinides and for developingefficient laser-cooling and ionization schemes for actinium, with possibleapplications for high-purity medicalisotope production and future fundamentalphysics experiments with this atom.

Detection of missing low-lying atomic states in actinium