Abstract
The internal optic modes of single crystal RbClO3 and RbBrO3 are observed by Raman scattering and near normal incidence infrared reflection spectroscopy. Vibrational modes are then studied in several mixed crystals in which one anion has been isomorphously substituted for the other. The Raman spectra of microcrystalline powders of both single and mixed crystals are shown to map out an oblique phonon density of states. The mixing of the ν1 and ν3 intramolecular motions is observed in the oblique phonons of the mixed crystals and is followed as a function of relative anion concentration. Residual dynamical interactions apparently persist into the high dilution limit in the mixed crystals for both guest ClO3− in host RbBrO3 and guest BrO3− in host RbClO3. Finally these results are compared with a similar study of NaClO3/NaBrO3 mixed crystals. The near accidental degeneracy of ν1 and ν3 observed in the sodium system also occurs in the rubidium system.
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