Multiple site effects on the Raman spectra of RbNO3 and CsNO3

Abstract

Multiple band structure in the symmetric stretching region of the Raman spectra of RbNO₃ IV and CsNO₃ II confirms the presence of NO₃⁻ ions on three distinct crystallographic C₁ sites and supports the proposed $C_3^2$ or $C_3^3$ space group. Assignments were confirmed by ¹⁸O‐isotopic dilution studies.