Isotope study of the nonlinear pressure shifts of ${}^{85}$Rb and ${}^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

B. H. McGuyer

Measurements of the 0--0 hyperfine resonant frequencies of ground-state ${}^{85}$Rb atoms show a nonlinear dependence on the pressure of the buffer gases Ar, Kr, and Xe. The nonlinea…