The change Δ(E) in transition frequency of the (F=4, MF=0)↔(F=3, MF=0) transition of the ground state of Cs¹³³ as a result of the application of an external electric field E has been calculated theoretically. The effects of differences in the ground-state wave functions due to the hyperfine interaction have been included, as well as differences in energy denominators due to hyperfine structure. The calculation gives Δ(E)=-1.9×10^-6(1±0.1)E² cps, which is to be compared with the experimental value of -2.29×10^-6(1±0.03)E² cps, where E is in V/cm.
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Feichtner et al. (1965) studied this question.
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