Knowledge Bank

A new dispersion analysis is proposed to fit the data available from infrared reflection measurements of cubic ionic crystals such as sodium chlorate and bromate in the $1000cm-1$ region. The agreement between theory and experiment is obtained by the trial and error method, (a high speed 1620 IBM computer is used). New values are determined for infrared oscillator strengths of the chlorate or bromate $C3v$ ions, and for the effective charge of the electron which is found to be 0.52 e. On the other hand, vibrational frequencies and damping constants are very close to the usual ones obtained from Raman spectra or from Drude-Lorentz classical dispersion analysis.