Abstract

The polarized Raman spectra of single-crystal ⁶LiRbSO₄ and ⁷LiRbSO₄ at room temperature are reported. On the basis of these data, symmetry-based band assignments are given for both internal and external optic modes. The translational optic modes of the lithium ion appear in the region between 444 and 364 cm⁻¹. Vibrational coupling interactions are noted between the sulfate ion <i>v</i>₂ and the lithium translational optic modes in the same irreducible representation. Coupling interactions are negligible or small in ⁷LiRbSO₄, while in ⁶LiRbSO₄ the lithium isotope effect shifts the lithium translational modes into more coupling interaction with the sulfate ion <i>v</i>₂ modes.

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