Abstract
The vibrational modes and the calculated Raman spectra of computer generated models of sodium silicate glasses are presented and discussed. The localization of the vibrational modes on non-bridging oxygens (NBOs) increases linearly with increasing NBO/Si in all spectral ranges. Strongest localization is observed in the low-frequency range near the 225 and 320 cm −1 vibrational bands. The shape of the partial Raman spectra of SiO 4 tetrahedra with different number of NBOs (Q n species) is complex and depends both on the glass composition and the connectivity of the Q n species. The estimated Q n scattering cross-sections increase with increasing the number of bridging oxygens.
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