Structural significance of Raman spectra of 0H- and F-doped vitreous silica.

The narrow defect Raman bands found in melt-quenched vitreous silica are also observed at the same frequencies and with the same band widths in heavily 0H- and F-doped porous vitreous silica prepared by the sol-gel process. The chemical shifts in these bands as the internal surface area and the 0H- and F-content are varied provide decisive evidence on the molecular structure of melt-quenched vitreous silica as described recently by two opposing models.