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An improved microwave spectrograph has been developed which permits measurements of electric field intensity to one part in ten thousand. The instrument is employed to make precise Stark effect measurements. A method is also given for measuring the polarizability of polar molecules in a given rotational state. The transition J=1→2, ΔM=0 for the ground vibrational state of carbonyl sulfide (OCS) was studied and the electric dipole moment was determined to be (0.7124±{}0.0002) Debye units. In addition the polarizability anisotropy (αzz-αₓₓ) was measured and found to be (2.4±{}3.0)×{}10^-24 cm³.Effects caused by the fourth-order term in the perturbation expansion for the Stark Effect were observed and found to be in good agreement with theoretical predictions.
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Marshall et al. (1957) studied this question.
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