title: Electric quadrupole shift cancellation in single-ion optical frequency standards.
abstract: The electric quadrupole shift is presently the most significant source of uncertainty on the systematic shifts for several single-ion optical frequency standards. We present a simple method for cancelling this shift based on measurements of the Zeeman spectrum of the clock transition. This method is easy to implement and yields very high cancellation levels. A fractional uncertainty of 5 x 10(-18) for the canceled quadrupole shift is estimated for a measurement of the absolute frequency of the 5s (2)S(1/2)-4d (2)D(5/2) clock transition of 88Sr+.
authors.affiliation: Institute for National Measurement Standards, National Research Council, Ottawa, Canada K1A 0R6. Pierre.Dube@nrc-cnrc.gc.ca
authors.forename: P
authors.initials: P
authors.lastname: Dubé
authors.forename: A A
authors.initials: AA
authors.lastname: Madej
authors.forename: J E
authors.initials: JE
authors.lastname: Bernard
authors.forename: L
authors.initials: L
authors.lastname: Marmet
authors.forename: J-S
authors.initials: JS
authors.lastname: Boulanger
authors.forename: S
authors.initials: S
authors.lastname: Cundy