Raman spectrum of cadmium nitrate

Abstract

The Raman spectra of Cd(NO₃)₂,4H₂O and anhydrous Cd(NO₃)₂ are reported. The spectrum of Cd(NO₃)₂,4H₂O is compatible with the known crystal structure Fdd2. The spectrum of the anhydrous salt is complex and indicates that the 16 NO₃^- ions are on four sites with different potential energy environments and each site is occupied by four NO₃^- ions. The centrosymmetric space group Pbcm is favoured to the non- centrosymmetric space group Pca2₁. Multiple-site splitting, site- symmetry splitting and correlation-field splitting are used to explain the complex band structures.