Vibrational Spectra of Single Crystals of Group I Nitrates

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Abstract
The Raman and infrared spectra of single crystals of the nitrates of the alkali metals and silver have been studied at room temperature. The internal vibrations of the nitrate ion and the external vibrations of the crystal lattice are assigned on the basis of a factor‐group analysis of the crystal. For the rhombohedral crystals the frequencies were little changed from those expected for a free ion with the exception that infrared and Raman frequencies were distinct. For crystals of lower symmetry the vibrations of the free ion give rise to many components which can, however, be adequately described on the basis of the factor‐group analysis. Strong combination bands between internal and external vibrations are observed and assigned in the infrared spectra.