The revised disorder induced scattering theory mode was applied to analyze the effect of Raman coupling coefficient on Raman scattering in glass ceramics(PbF

2

+WO

3

+GeO

2

(PWG)).Although the Raman coefficient is generally attributed to be frequency-dependent

it is formally the Fourier component of the spatial correlation function.The Raman coupling coefficient is therefore rigorously momentum (wavevector)dependent

thus describe the momentum conserving interactions occurring within a glass ceramics materials during an Raman scattering process.Analysis of the spectral distribution curves for thermally active vibrational states in PWG showed the coupling coefficient to be qualitatively represented by the inclusion of an exponential decay dependence.The sum of a harmonic potential and the spatial correlation function(interaction potential)associated with the coupling coefficient is shown to yield a distorted harmonic closely resembling an asymmetric double well potential.The relevance of this combined potential is discussed with respect to relaxational mode behavior.