“…From previous works and compilations [30,31], a first general observation appears that most O-associated defects can be excluded as viable candidates since they generally have principal g-values with at least one g-value much larger than those inferred for the OS signal. Based on the principal values of the g-matrix, for example, it is impossible to assign the OS center to the interstitial ozonide O À 3 ion (g 1 = 2.018, g 2 = 2.011, g 3 = 2.002) as observed by Griscom and Friebele [32] in high-potassium content SiO 2 .…”