Abstract
We continue our experiments on millimeter-wave spectroscopy of higly-excited Rydberg atoms with two valence electrons. In this work we have measured frequencies of 16 transitions between Rydberg triplet 4snf3FJ and singlet 4snd1D2, 4sng1G4 levels of neutral zinc (Zn I) in the frequency range 87–141 GHz and in the principal quantum number range n=30–37. The observed transitions were driven predominantly from triplet 4snf3F3 levels that were excited by a three-step laser excitation scheme 4s21S0 → 4s4p3P1 → 4s4d3D2 → 4snf3F3. The measured frequencies as well as those obtained in our previous work (Kutsenko et al., 2015, J. Phys. B: At. Mol. Opt. Phys. 48, 245,005) were used to derive the Ritz expansion coefficients for triplet F states in the framework of the single-channel quantum defect theory.
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