Using molecular beam electric deflection, the temperature dependence of polar behavior has been studied for the molecules CF4, CCl4, SiF4, SiCl4, GeCl4, TiF4 TiCl4, VF4, VF4, and VCl4. A number of these molecules show polar behavior consistent with a vibrationally induced dipole moment for states with one or both of the triply degenerate vibrations excited. In four of the tetrachloride species, the presence of a vibrationally induced dipole moment was confirmed by the change in polar behavior with isotopic substituion of the Cl atoms. The deflection behavior of the transition metal tetrahalides varied from nonpolar in VCl4 to very polar in TiF4.
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