Structure of low-temperature IR absorption spectra of KCl and KBr crystals with NO2− and NO3− anion impurities

The vibrational and hyperfine structure of the infrared absorption spectra of KCl and KBr crystals doped with the molecular monovalent anions of nitrogen dioxide and nitrogen trioxide and additionally doped or not doped with divalent cations of calcium and barium is analyzed at a temperature of 4.2 K in this paper. The penetration of the ions into the crystal lattices and their complexing behavior with the halides are determined. The isotopic structure of the infrared spectra is also analyzed for nitrogen dioxide and trioxide anions comprised of nitrogen 14/oxygen 16, nitrogen 15/oxygen 16, nitrogen 14/oxygen 18, and nitrogen 14/oxygen 16/oxygen 18 isotope compositions.