¹⁸O-labeled interstitial oxygen molecules as probes to study reactions involving oxygen-related species in amorphous SiO₂

Isotope labeling has been widely used to study reactions involving oxygen species in amorphous SiO₂ (a-SiO₂). This article briefly describes recent progress in ¹⁸O labeling techniques to study reactions involving interstitial oxygen molecules (O₂), which is one of the most important excess oxygen species in a-SiO₂. The primary focus will be on the combination of the ¹⁸O labeling with photoluminescence spectroscopy, which enables sensitive and selective detection of interstitial O₂. Advantages of this method and results of evaluation of oxygen exchange between interstitial O₂ and the Si - O network of a-SiO₂ will be presented.