Hanni, M. E.Keele, Julie A.Lundeen, S. R.Fehrenbach, C. W.Sturrus, W. G.2023-12-072023-12-072010-04-16https://hdl.handle.net/2097/43799The binding energies of high-L Rydberg levels of Pb+ with n=19 or 20 and 6⩽L⩽10 were measured with resonant excitation Stark ionization spectroscopy (RESIS). When combined with previous measurements of members of the nh Rydberg series in Pb+, and analyzed with the long-range polarization model, these determined the polarizability of the 5d106s2 ground state of Pb2+ to be αd = 13.62(8) a.u. This value is substantially larger than the estimate published recently based on the measured lifetime of the 6s6p1P1 resonance level of Pb2+, 7.9(6) a.u. The difference is mostly due to the polarizability of Pb4+, the 5d10 core of the Pb2+ ion. This was established by observation of resolved fine structure in the excitation of n=39, high-L Rydberg levels of Pb3+, using the same RESIS technique. Analysis of this spectra determined the polarizability of Pb4+ to be αd = 3.61(4) a.u. Reanalysis of optical spectra of nh and ng levels in Pb+ and Pb3+ in view of the polarizabilities determined in the RESIS studies indicates revised ionization energies of both ions, EI(Pb+) = 121245.28(6) cm−1 and EI(Pb3+) = 341 435.1(8) cm−1.© American Physical Society (APS). This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).http://rightsstatements.org/vocab/InC/1.0/https://web.archive.org/web/20181120135245/https://journals.aps.org/copyrightFAQ.htmlText