Precise measurement of Yb-171 magnetic constants for (1) S (0)-(3) P (0) clock transition

We present a precise measurement of Yb-171 magnetic constants for (1) S (0)-(3) P (0) clock transition. The background magnetic field is firstly compensated to < 1 mGs (1 Gs = 10(-4) T) through measuring the splitting of two pi transitins of Yb-171 clock transition at different compensation coils currents. Then, the splitting ratios of the pi and sigma components of Yb-171 clock transition at different bias magnetic fields are measured, and the first-order Zeeman coefficient is determined to be alpha = 199.49(5) Hz/Gs. The second-order Zeeman shifts at various bias magnetic fields are also measured through interleaved self-comparison in which the bias magnetic fields are modulated between high and low values. The second-order Zeeman coefficient is fitted to be beta = -6.09(3) Hz/mT(2), which is consistent with the result of NIST group.