Abstract
The dc-Stark shift of the magnesium 3s 2( 1S 0)−3s3p( 3P 1) line is measured by subjecting both arms of an atom interferometer to a constant electric field. In this interferometer based on Ramsey's method of separated oscillating fields each arm is uniquely associated with either the upper or lower state of the intercombination transition, so that the Stark energy perturbation provides two different potentials in the two arms of the interferometer. The resulting relative phase shift corresponds to a difference of −(8.0±1.0) kHz ( kV/ cm) -2 in the polarizabilities of the 1S 0 and the 3P 1 (|m| = 1) states, in agreement with a theoretical calculation.
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