We report measurements of the absolute excitation frequencies of $^{165}\mathrm{Ho}$ $4{f}^{11}6sns$ and $4{f}^{11}6snd$ 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) ${\mathrm{cm}}^{\ensuremath{-}1}$. From the series convergence, we determine the first ionization potential ${E}_{\mathrm{IP}}=48565.910(3)$ ${\mathrm{cm}}^{\ensuremath{-}1}$, which is three orders of magnitude more accurate than previous work. This work is an important step towards using Ho atoms for collective encoding of a quantum register.We report measurements of the absolute excitation frequencies of $^{165}\mathrm{Ho}$ $4{f}^{11}6sns$ and $4{f}^{11}6snd$ 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) ${\mathrm{cm}}^{\ensuremath{-}1}$. From the series convergence, we determine the first ionization potential ${E}_{\mathrm{IP}}=48565.910(3)$ ${\mathrm{cm}}^{\ensuremath{-}1}$, which is three orders of magnitude more accurate than previous work. This work is an important step towards using Ho atoms for collective encoding of a quantum register.

arXiv:1412.1428Physical Review AJan 16, 201525 citations

High resolution spectroscopy of Rydberg atom interactions

Kelly Cooper Younge, Aaron Reinhard, P. R. Berman +1 more

Bulletin of the American Physical SocietyJun 8, 20070 citations

We report measurements of the absolute excitation frequencies of

^{165}\mathrm{Ho}

4{f}^{11}6sns

and

4{f}^{11}6snd

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) ${\mathrm{cm}}^{\ensuremath{-}1}$. From the series convergence, we determine the first ionization potential

{E}_{\mathrm{IP}}=48565.910(3)

${\mathrm{cm}}^{\ensuremath{-}1}$, which is three orders of magnitude more accurate than previous work. This work is an important step towards using Ho atoms for collective encoding of a quantum register.