Electrolytic coloration and spectral properties of hydroxyl-doped potassium bromide single crystals

Hydroxyl-doped potassium bromide single crystals are colored electrolytically at various temperatures and voltages by using a pointed cathode and a flat anode. The characteristic OH− spectral band is observed in absorption spectrum of uncolored single crystal. The characteristic O−, OH−, U, V2, O2−−Va+, ML1, F and M spectral bands are observed simultaneously in absorption spectra of colored single crystals. Current–time curve for electrolytic coloration of hydroxyl-doped potassium bromide single crystal and its relationship with electrolytic coloration processes are given. Production and conversion of color centers are explained.