Abstract
The structures of free tetramethyldigermene Me 2GeGeMe 2 and of a nitromethane dimer liquid mixture are confirmed by their infrared and Raman spectra. Quantum mechanical methods have been used for the calculation of the intensities of Raman-active lattice vibrations in crystalline urea. The frquency and intensity calculations are based on the structural data of the compounds referred to. In a first step the frequencies and eigenvectors of the modes are calculated; in the case of organic crystals the flexible vibrating molecules within the intermolecular atom-atom forces are considered and finally, a semiemperical method is extended to cover the relative Raman intensities of the external and internal modes.
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