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The symmetry properties of the lattice dynamics of nonrigid molecular crystals are dis-cussed on mass-weighted translational coordinates and inertia moment-weighted rotational coor-dinates as well as molecular internal normal coordinates in molecular principal axes frame.Anequivalent reducible representation of the wavevector group and the classification of molecular crystalnormal modes are provided.A detailed illustrative example is presented.
The symmetry properties of the lattice dynamics of nonrigid molecular crystals are dis-cussed on mass-weighted translational coordinates and inertia moment-weighted rotational coor-dinates as well as molecular internal normal coordinates in molecular principal axes frame. An economically reducible representation of the wavevector group and the classification of molecular crystal normal modes are provided. A detailed illustrative example is presented.