Accurate measurement of the 12.6 GHz “clock” transitionin trapped 171Yb+ ions

摘要

We have measured the frequency of the 171Yb+n12.6 GHz MF=0→0 ground state hyperfinen“clock” transition in buffer gas-cooled ion clouds confinednin two similar, but not identical, linear Paul traps. After correctionnfor the known differences between the two ion traps, includingnsignificantly different second-order Doppler shifts, the frequenciesnagree within an uncertainty of less than 2 parts in 1013. Ournbest value, based on an analytic model for the second-order Dopplernshift, for the frequency of the clock transition of an isolated ion atnzero temperature, velocity, electric field and magnetic field, isn12642812118.466+0.002 Hz