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An atomic-beam magnetic-resonance apparatus with separated oscillatory fields has been used to measure the decrease in the ground-state hyperfine energy separation of Cs¹³³, Rb⁸⁷, Rb⁸⁵, K³⁹, Na²³, and Li⁷ because of the presence of a uniform, static, electric field. The hfs frequency shift due to this quadratic Stark effect is designated by δf=-k×10^-6E² Hz/(V/cm)². If the ratio δf(XA)δf(Cs¹³³) is denoted by κ_XA, then the results are κ_Rb⁸⁷=0.546(5); κ_Rb⁸⁵=0.243(1), κ_K³⁹=0.0315(6), κ_Na²³=0.0552(12), and κ_Li⁷=0.0270(8). Existing theories of the alkali-metal Stark effect are discussed, and none is found to give satisfactory agreement with these experimental ratios.
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J. R. Mowat (1972) studied this question.
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