Abstract
The Ramsey fringes on the ground-state hyperfine transition of 199Hg+ (ΔF = 1, ΔmF = 0) ions trapped in a hyperbolic Paul trap are firstly observed with the method of time-separated oscillatory fields. The full width at half maximum of central Ramsey fringes is about 25 mHz and the corresponding quality factor Q of the line is greater than 1012 for the trapped 199Hg+ microwave frequency standard. The hyperfine transition frequency shifted by magnetic field is also measured by the high-resolution Ramsey fringes. The final result is Δνh f s = 40507347997.3(0.5) Hz, which is corrected to zero magnetic field.
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