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Accurate measurement of the 12.6 GHz "clock" transition in trapped /sup 171/Yb/sup +/ ions

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4 Author(s)
Fisk, P.T.H. ; Nat. Meas. Lab., CSIRO, Lindfield, NSW, Australia ; Sellars, M.J. ; Lawn, M.A. ; Coles, C.

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.

Published in:

Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on  (Volume:44 ,  Issue: 2 )

Date of Publication:

March 1997

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