摘要: An attempt has been made to describe the vibrational spectrum of a vitreous material in terms simple model based on unit cell crystal. The adapted include broad distributions intertetrahedral angles and configurations which are salient features structures silicate glasses. Normal coordinate calculations spectra models representing chain silicates silica have performed. results show that some detailed structural information is accessible using this approach it possible provide explanations for shape infra-red sodium metasilicate at high frequencies offer reason low-frequency Raman continuum excess absorption all