Raman spectrum of strontianite (SrCO3)
The Raman spectrum of strontianite (SrCO3) has been studied for the first time using the λ 2537 resonance radiation of mercury as the exciter. The observed spectrum has been compared with that of aragonite which is isomorphous with strontianite. Out of the 13 frequency shifts recorded, 5 have been attributed to the internal oscillations of the CO3 ion and the remaining 8 to the lattice oscillations. The splitting of the degenerate v4 vibration of the free CO3 ion in the crystal into 3 frequencies and also the observed relative intensity of the lines 150 cm.-1 and 184 cm.-1 arising from the angular oscillations of the CO3 ions about their principal axes of inertia, indicate a considerable distortion in the symmetry of the CO3 ion in strontianite as in the case of aragonite.