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A new method is deduced to calculate the Raman spectra of vitreous or molten silicate. This method includes five steps: (I) molecular dynamics simulation to generate thousands of vitreous or molten configurations in equilibrium;(ii) decomposing the configurations into five kinds of defined tetrahedral units; (iii) normal vibrational analysis with Wilsons GF matrix method for the eigenfrequencies and eigenvectors of each tetrahedral unit; (iv) Raman intensity calculations for each vibrational mode by utilizing the electro-optical parameter method and bond polarizability model; (v) accumulating the data of frequencies and corresponding intensities to form the partial Raman spectral line of each defined tetrahedral unit and finally the envelope.