D1 line broadening and hyperfine frequency shift coefficients for Rb87 and Cs133 in Ne, Ar, and N2

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 $^{87}\mathrm{Rb}$ and $^{133}\mathrm{Cs}$ due to collisions with Ne and Ar atoms, as well as ${\mathrm{N}}_{2}$ molecules which is commonly employed for quenching in gas cell atomic clocks.