Title :
Accurate measurement of the 12.6 GHz "clock" transition in trapped /sup 171/Yb/sup +/ ions
Author :
Fisk, Peter T H ; Sellars, Matthew J. ; Lawn, Malcolm A. ; Coles, Colin
Author_Institution :
Nat. Meas. Lab., CSIRO, Lindfield, NSW, Australia
fDate :
3/1/1997 12:00:00 AM
Abstract :
We have measured the frequency of the /sup 171/Yb/sup +/ 12.6 GHz M/sub F/=0/spl rarr/0 ground state hyperfine "clock" transition in buffer gas-cooled ion clouds confined in two similar, but not identical, linear Paul traps. After correction for the known differences between the two ion traps, including significantly different second-order Doppler shifts, the frequencies agree within an uncertainty of less than 2 parts in 10/sup 13/. Our best value, based on an analytic model for the second-order Doppler shift, for the frequency of the clock transition of an isolated ion at zero temperature, velocity, electric field and magnetic field, is 12642812118.466+0.002 Hz.
Keywords :
Doppler effect; Doppler shift; atomic clocks; ground states; hyperfine structure; microwave measurement; microwave spectra; particle traps; positive ions; trapped ions; ytterbium; /sup 171/Yb/sup +/ ion trap; 12.6 GHz; Yb; buffer gas-cooled ion cloud; frequency measurement; ground state hyperfine clock transition; linear Paul trap; second-order Doppler shift; Clocks; Clouds; Doppler shift; Frequency measurement; Magnetic confinement; Magnetic field measurement; Prototypes; Radio frequency; Stationary state; Temperature;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
