Hyperfine constants and line separations for the ${}^1{S}_0-{}^3{P}_1$ intercombination line in neutral ytterbium with sub-Doppler resolution

Abstract

Optical frequency measurements of the intercombination line $(6s^2){}^1{S}_0-(6s6p){}^3{P}_1$ in the isotopes of ytterbium are carried out with the use of sub-Doppler fluorescence spectroscopy on an atomic beam. A dispersive signal is generated to which a master laser is locked, while frequency counting of an auxiliary beat signal is performed via a frequency comb referenced to a hydrogen maser. The relative separations between the lines are used to evaluate the ${}^3{P}_1$-level magnetic dipole and electric quadrupole constants for the fermionic isotopes. The center of gravity for the ${}^3{P}_1$ levels in ${}^{171}$Yb and ${}^{173}$Yb are also evaluated, where we find significant disagreement with previously reported values. These hyperfine constants provide a valuable litmus test for atomic many-body computations in ytterbium.

10 pages, 8 figures

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• Rydberg quantum computation with nuclear spins in two-electron neutral atoms
• Hyperentanglement of divalent neutral atoms by Rydberg blockade
• Violation of the equivalence principle induced by oscillating rest mass and transition frequency, and its detection in atom interferometers
• Intercombination line frequencies in ${}^{171}$Yb validated with the clock transition
• Isotope-shift analysis with the $4f^{14}6s^2{}^1{S}_0-4f^{13}5d6s^2(J=2)$ transition in ytterbium
• Deterministic nuclear spin squeezing and squeezing by continuous measurement using vector and tensor light shifts