LAUSR

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.