${D}_{1}$ line broadening and hyperfine frequency shift coefficients for $^{87}\mathrm{Rb}$ and $^{133}\mathrm{Cs}$ in Ne, Ar, and ${\mathrm{N}}_{2}$

$D_{1}$ line broadening and hyperfine frequency shift coefficients for ${}^{87}{Rb}$ and ${}^{133}{Cs}$ in Ne, Ar, and $N_{2}$

Li-Chung Ha, Xianli Zhang, Nakri Dao, and K. Richard Overstreet

Phys. Rev. A 103, 022826 – Published 19 February 2021

Abstract

Accurate measurements of optical line broadening and microwave hyperfine transition shifts are essential for optimizing the performance of buffer-gas atomic clocks. Previous literature has reported inconsistent measurement values. We report measurements of the $D_{1}$ transition broadening and hyperfine frequency shift coefficients for ${}^{87}{Rb}$ and ${}^{133}{Cs}$ due to collisions with Ne and Ar atoms, as well as $N_{2}$ molecules which is commonly employed for quenching in gas cell atomic clocks.