# Hyperfine constants and line separations for the $^{1}S_{0}-\,^{3}P_{1}$ intercombination line in neutral ytterbium with sub-Doppler resolution

## TL;DR

This study precisely measures the hyperfine constants and line separations of the intercombination line in neutral ytterbium using sub-Doppler spectroscopy, providing data crucial for testing atomic many-body theories.

## Contribution

It offers new, highly accurate hyperfine constants and line separations for ytterbium isotopes, with discrepancies noted from previous measurements, advancing atomic physics research.

## Key findings

- Hyperfine constants for ytterbium isotopes are determined with high precision.
- Significant disagreement found with previously reported values for the $^3P_1$ levels.
- The results serve as benchmarks for atomic many-body calculations.

## 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 $^3P_1$ 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.