The farhyphen;infrared spectra of polycrystalline ethylene were recorded at various temperatures between 65deg; and 20deg;K and at 8deg;K. Two bands were observed both for ethylene and ethylenehyphen;d4. The frequency ratio of corresponding bands in ethylene and deuteroethylene prove that these absorption bands are due to translational lattice modes. Absolute intensities of the observed bands in ethylene were measured. The frequencies of the translational lattice modes were calculated for two different models of intermolecular forces, i.e., centerhyphen;tohyphen;center Lennardhyphen;Jones potential and atomndash;atom repulsion potential.
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