The 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 5d 10 6s 2 ground state of Pb 2+ to be α d = 13.62(8) a.u. This value is substantially larger than the estimate published recently based on the measured lifetime of the 6s6p 1 P 1 resonance level of Pb 2+ , 7.9(6) a.u. The difference is mostly due to the polarizability of Pb 4+ , the 5d 10 core of the Pb 2+ ion. This was established by observation of resolved fine structure in the excitation of n = 39, high-L Rydberg levels of Pb 3+ , using the same RESIS technique. Analysis of this spectra determined the polarizability of Pb 4+ to be α d = 3.61(4) a.u. Reanalysis of optical spectra of nh and ng levels in Pb + and Pb 3+ in view of the polarizabilities determined in the RESIS studies indicates revised ionization energies of both ions, E I (Pb + ) = 121245.28(6) cm −1 and E I (Pb 3+ ) = 341 435.1(8) cm −1 .
Ten fine-structure intervals separating n =10, I =4, 5, 6, and 7 Rydberg states of H2, all with (v=0, R =1) H2+ cores, have been measured using fast-beam microwave-optical techniques, determining the relative positions of all these states to a precision of about +0.3 MHz. These experimental results are compared with predictions of the expected structure, which use the polarization model to relate the Rydberg fine structure to properties of the H2 ion, yielding experimental determinations of certain electric properties of the (0, 1) state of H2+. quadrupole moment, Q = 1.64295(30)eao, and dipole polarizabilities, 0. & = 3. 1770(34)ao, nT =4.015(36)ao.
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