A quantum lattice dynamics formulation is presented for molecular solids, including translational and librational modes. The variational principle is used to construct ground and excited state wavefunctions obeying the translational symmetry of the crystal. For translational modes the formalism reduces to a form similar to previous quantum lattice dynamics treatments. The results for librational modes are new. General properties of the librational wavefunctions and matrix elements are derived for linear molecules interacting through arbitrary anisotropic pair potentials.
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N. Jacobi (1972) studied this question.
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