Abstract
Polarized Raman and infrared reflection spectra of KNO 3 crystals have been measured at room temperature. Raman and infrared transmission spectra of the high temperature phase of KNO 3 have been also measured. The frequencies of the transverse (TO) and longitudinal (LO) modes of the infrared active vibrations of the crystal have been obtained from the observed reflectivities. The lattice dynamical analysis of the optical active vibrations of the room temperature phase of KNO 3 has been made based on a rigid ion model which includes effective ionic charges and short-range repulsive force constants. Short-range force constants for the non-bonded metal-oxygen and oxygen-oxygen interactions have been determined by the least squares method using the observed Raman frequencies.
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