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

The effects of ultraviolet (UV) irradiation and heat-treatment on hydrogen speciation in H-2 loaded Ge-doped silica glasses have been investigated usi ng Fourier transform infrared(FTIR) spectroscopy and high-resolution H-1 nu clear magnetic resonance (NMR) spectroscopy. Various H-bearing species, inc luding H-2, SiOH, GeOH, SiH, GeH, GeH2, are identified in the glasses. Thei r characteristic infrared 7(IR) absorption frequency and H-1 NMR chemical s hift values are determined, and the molar absorption coefficients of these IR bands calibrated. IR measurements based on the molar absorption coeffici ents calibrated in this study indicate that GeH and OH are the major H-bear ing species produced in hydrogen-loaded germanosilicate glass upon intense UV irradiation. (C) 1999 Elsevier Science B.V. All rights reserved.