New measurements of high-lying even parity 6sns 1 S0 and 6snd 3,1 D2 levels of neutral 174 Yb are presented in this paper. Spectroscopy is performed by a two-step laser excitation from the ground state 4f 14 6s 2 1 S0, and the Rydberg levels are detected by using the field ionization method. Additional two-photon microwave spectroscopy is used to improve the relative energy accuracy where possible. The spectroscopic measurements are complemented by a multichannel quantum defect theory (MQDT) analysis for the J=0 and the two-coupled J=2 even parity series. We compare our results with the previous analysis of Aymar et al [1] and analyze the observed differences. From the new MQDT models, a revised value for the first ionization limit I6s = 50443.07041(25) cm −1 is proposed.
Using a microwave and radio frequency resonance approach we observe the transitions of ytterbium from the 6s(n + 3)d states to the 6snℓ states for 4 ≤ ℓ ≤ 6 and 28 ≤ n ≤ 33. The energies of the 6snℓ states of ℓ ≥ 4 are determined from the observed intervals and the known values of the 6snd energies. We use a non-adiabatic core polarization model to analyze the energy levels to determine the dipole (α d ) and quadrupole (α q ) polarizabilities of the ground state of Yb + . We find the values α d = 60.51(10) a 3 0 and α q = 672(28) a 5 0 .
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