ESR Spectra from Paramagnetic Centers in Irradiated KClO4. III. Centers Appearing between 10 and 200°K

ESR spectra of KClO4 crystals irradiated with x rays at 10 and at 26°K contain three “families” of intense signals. The signals are assumed to derive from primary defects constituted by electrons and holes trapped on ClO4− ions. The families of signals are assigned to the species ClO4=, ClO4, and (ClO4)2−, each trapped in a number of distinct sites. ClO4= and ClO4 appear to be stabilized by intraionic configuration change, whereas interionic configuration change may stabilize (ClO4)2−. Thermal processes starting at 30°K result in formation of the secondary defects O3− from ClO4= and ClO2 from ClO4 and in destruction of (ClO4)2−.