We report on measurements on the 5S-6P rubidium transition frequencies for rubidium isotopes with an absolute uncertainty of better than \SI{ 450}{ kHz} for the 5S $\rightarrow$ 6P$_{ 1/2}$ transition and \SI{ 20}{ kHz} for the 5S $\rightarrow$ 6P$_{ 3/2}$ transition, achieved by saturation absorption spectroscopy. From the results we derive the hyperfine splitting with an accuracy of \SI{ 460}{ kHz} and \SI{ 30}{ kHz}, respectively. We also verify the literature values for the isotope shifts as well as magnetic dipole constant and the electric quadrupole constant.
Categories: physics.atom-ph