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The terahertz Kerr effect (TKE) of polar molecular vapors is reported. The birefringence signal of fluoroform appears with opposite polarity compared to acetonitrile and water. This behavior is a hallmark of the opposite sign of a new molecular polarizability anisotropy ΔαTKE=αzz-(αxx+αyy)/2, with αzz being the polarizability along the permanent dipole moment. As the excitation of the rotational states...
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