Infrared absorption spectra of SO 3 2? ions present as impurities in KCl and KBr crystals

IR spectroscopy of KBr salt and crystals

“…KBr crystals were grown by an open Kyropulos method. The observed in the IR spectra absorption bands were interpreted by the deformation and valence vibrations of molecular anions and their complexes with the polyvalent cations [1][2][3][4]. Concentration of Na + ions in the KBr salt was measured by the IR spectra of KBr pellets prepared in a humid atmosphere.…”

“…It is known that no absorption bands should be present in the IR spectra of KBr crystals. This is primarily achieved by a high degree of the KBr salt purity with respect to oxygen-containing molecular anions: SO 4 2 , NO 3 , NO 2 etc. apart from this, the impurity polyvalent cations M 2+ (where M = Ca, Ba, Mg, Pb) may form complexes M 2+ SO 4 2 which are also revealed in the IR spectra of KBr pellets and crystals.…”