Measurement of Holmium Rydberg series through MOT depletion spectroscopy
Hostetter, J. · Pritchard, J. D. · Lawler, J. E. · Saffman, M.
Original · EN
We report measurements of the absolute excitation frequencies of ¹⁶⁵Ho 4f¹¹6sns and 4f¹¹6snd odd-parity Rydberg series. The states are detected through depletion of a magneto-optical trap via a two-photon excitation scheme. Measurements of 162 Rydberg levels in the range n=40-101 yield quantum defects well described by the Rydberg-Ritz formula. We observe a strong perturbation in the ns series around n=51 due to an unidentified interloper at 48515.47(4) cm⁻¹. From the series convergence, we determine the first ionization potential EᵢP=48565.939(4) cm⁻¹, which is three orders of magnitude more accurate than previous work. This work represents the first time such spectroscopy has been done in Holmium and is an important step towards using Ho atoms for collective encoding of a quantum register.
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