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For a large number of ZXY3(C3v) and ZXY2(C2v) molecules and ions symmetry force constants, mean amplitudes of vibration for bonded and nonbonded distances and Coriolis coupling constants have been calculated.

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A normal‐coordinate analysis has been performed for the molecular vibrations of B2Cl4. The force constants were used to calculate the mean amplitudes of vibration. Also the framework mean amplitudes for the long Cl···Cl distance was studied as a function of the angle of internal rotation.