Precise measurement of 171Yb magnetic constants for 1S0-3P0 clock transition

We present a precise measurement of 171 Yb magnetic constants for 1So-3P0 clock transition.The background mag-netic field is firstly compensated to＜1 mGs(1 Gs=10-4 T)through measuring the splitting of two π transitins of 171 Yb clock transition at different compensation coils currents.Then,the splitting ratios of the I and o components of 171Yb clock transition at different bias magnetic fields are measured,and the first-order Zeeman coefficient is determined to beα=199.49(5)Hz/Gs.The second-order Zeeman shifts at various bias magnetic fields are also measured through inter-leaved self-comparison in which the bias magnetic fields are modulated between high and low values.The second-order Zeeman coefficient is fitted to be β=-6.09(3)Hz/mT2,which is consistent with the result of NIST group.