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We report measurements of the Stark shift of the cesium $6s \: ^2S_{3/2}\rightarrow 7p \: ^2P_{3/2} $ and the $6s \: ^2S_{1/2} \rightarrow 7p \:^2P_{1/2} $ transitions at $\lambda = 456$ nm and 459 nm, respectively, in anatomic beam. From these, we determine the static scalar polarizability for both7P states, and the tensor polarizability for the 7P$_{3/2}$ state. Thefractional uncertainty of the scalar polarizabilites is $\sim$0.18\%, whilethat of the tensor term is 0.66\%. These measurements provide sensitive testsof theoretical models of the Cs atom, which has played a central role in paritynonconservation measurements.

Measurement of the Stark shift of the $6s^2S_{1/2} \rightarrow 7p^2P_{J} $ transitions in atomic cesium