THEORY FOR THE INFRARED ABSORPTION INTENSITIES OF THE LATTICE VIBRATIONS OF MOLECULAR SOLIDS.
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Date
1967
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Ohio State University
Abstract
A theory has been developed for the infrared transition dipole intensities of the lattice vibrations in molecular solids. For non-polar molecules like $N_{2}$ and $CO_{2}$ the origin of the intensities lies in the non-zero dipole derivatives where the dipole is induced by the molecular quadurupole moments of the neighboring molecules in the lattice. The distortion moment is neglected. The results of the theory have been applied to experimental information, as far as available, for $N_{2}, CO_{2}$, and CO. Agreement between theory and experiment is found to be very good to within the error of the experimental data, i.e. a factor of 2. The theory also accounts satisfactorily for failure to observe absorption in solid $O_{2}$ and $CH_{4}$ for sample thicknesses investigated to date.
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Author Institution: Department of Chemistry University of Southern California, Los Angeles, California, 90007