The Ramsey fringes on the ground-state hyperfine transition of ^(199)Hg^(+)(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 ...The Ramsey fringes on the ground-state hyperfine transition of ^(199)Hg^(+)(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 10^(12) for the trapped ^(199)Hg^(+)microwave frequency standard.The hyperfine transition frequency shifted by magnetic field is also measured by the high-resolution Ramsey fringes.The final result isΔνhfs=40507347997.3(0.5)Hz,which is corrected to zero magnetic field.展开更多
A large cloud of ^(40)Ca^(+) is successfully trapped and manipulated in a linear ion trap.The axial length of the ion cloud is measured under a series of end-cap voltages.We propose a method of measuring the axial sec...A large cloud of ^(40)Ca^(+) is successfully trapped and manipulated in a linear ion trap.The axial length of the ion cloud is measured under a series of end-cap voltages.We propose a method of measuring the axial secular motion temperature of the ion cloud by analyzing its image on an electron-multiplying CCD.The method is based on the Boltzmann equation that the axial density distribution of ions at secular motion temperature T satisfies.The axial secular motion temperature of the ion cloud is also obtained by measuring the Doppler broadened line width.For the same trapping parameters,the axial secular motion temperature by analyzing the image of ion cloud is 840 K and by fitting the experimental resonance line profile is 700 K.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10904163,11074282.
文摘The Ramsey fringes on the ground-state hyperfine transition of ^(199)Hg^(+)(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 10^(12) for the trapped ^(199)Hg^(+)microwave frequency standard.The hyperfine transition frequency shifted by magnetic field is also measured by the high-resolution Ramsey fringes.The final result isΔνhfs=40507347997.3(0.5)Hz,which is corrected to zero magnetic field.
基金Supported by the National Natural Sciernce Foundation of China under Grant Nos 11074282,10904163.
文摘A large cloud of ^(40)Ca^(+) is successfully trapped and manipulated in a linear ion trap.The axial length of the ion cloud is measured under a series of end-cap voltages.We propose a method of measuring the axial secular motion temperature of the ion cloud by analyzing its image on an electron-multiplying CCD.The method is based on the Boltzmann equation that the axial density distribution of ions at secular motion temperature T satisfies.The axial secular motion temperature of the ion cloud is also obtained by measuring the Doppler broadened line width.For the same trapping parameters,the axial secular motion temperature by analyzing the image of ion cloud is 840 K and by fitting the experimental resonance line profile is 700 K.
