Precision measurement of light shifts in a single trapped Ba+ ion
J. A. Sherman, T. W. Koerber, A. Markhotok, W. Nagourney, E. N. Fortson
Abstract
Using a single trapped barium ion we have developed an rf spectroscopy technique to measure the ratio of the off-resonant vector ac Stark effect (or light shift) in the 6S1/2 and 5D3/2 states to 0.1% precision. We find R = DeltaS / DeltaD = -11.494(13) at 514.531 nm where DeltaS,D are the light shifts of the m = +/- 1/2 splittings due to circularly polarized light. Comparison of this result with an ab initio calculation of R would yield a new test of atomic theory. By appropriately choosing an off-resonant light shift wavelength one can emphasize the contribution of one or a few dipole matrix elements and precisely determine their values.
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