[20p-G203-1~8] 16.1 Fundamental properties, evaluation, process and devices in disordered materials

[20p-G203-7] Luminescence and Raman detection of interstitial Cl₂ and ClClO molecules in silica glasses

Linards Skuja¹, 〇Koichi Kajihara², Smits Krisjanis¹, Andrejs Silins¹, Hideo Hosono³ (1.Univ. Latvia, 2.TMU, 3.TITech)

Keywords:silica glass, interstitial chlorine molecules, photoluminesence

Chlorine is a common undesirable impurity in synthetic silica glass for ultraviolet optics and optical fibers. It is usually originated from the silicon source SiCl₄ and chlorine-based dehydration agents such as SOCl₂, and incorporated into glass as bound Si-Cl groups or interstitial Cl₂ molecules. We report a high-sensitivity detection of Cl₂ in silica glasses by near infrared photoluminescence (PL) and Raman spectroscopy, and discovery of interstitial dichlorine monoxide isomer (ClClO) molecule formed by reaction of O atoms with interstitial Cl₂.