Hydrogen speciation in hydrogen-loaded, germania-doped silica glass: a combined NMR and FTIR study of the effects of UV irradiation and heat treatment

Abstract The effects of ultraviolet (UV) irradiation and heat-treatment on hydrogen speciation in H2 loaded Ge-doped silica glasses have been investigated using Fourier transform infrared (FTIR) spectroscopy and high-resolution 1H nuclear magnetic resonance (NMR) spectroscopy. Various H-bearing species, including H2, SiOH, GeOH, SiH, GeH, GeH2, are identified in the glasses. Their characteristic infrared 7(IR) absorption frequency and 1H NMR chemical shift values are determined, and the molar absorption coefficients of these IR bands calibrated. IR measurements based on the molar absorption coefficients calibrated in this study indicate that GeH and OH are the major H-bearing species produced in hydrogen-loaded germanosilicate glass upon intense UV irradiation.

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