玻璃陶瓷PWG中的喇曼耦合系数对Raman散射的影响

应用修正的无序诱导散理论模型讨论了玻璃陶瓷（PbF2 WO3 GeO(PWG)中的喇曼耦合系数对Raman散射过程的影响。虽然普遍认为喇曼耦合系数是随频率而变化，但实际上它是空间相关函数的Furier分量，因此，严格地讲喇曼耦合系数是随动量（波矢q)而变化的，因而，玻璃陶瓷中的喇曼耦合系数描述了在Raman散射过程中发生在玻璃陶瓷中的动量交换相互作用。对于PWG中热活性拓动态的光谱分布曲线分析说明：指数衰减关系的卷积定性地表示了这个耦合系数。证明了简谐势与耦合系数有关的空间相关函数之和给出了非常类似于双阱势的畸变谐函数，根据弛豫模行为讨论了结合势的相关性。

Effect of Raman Coupling Coefficient on Raman Scattering in Glass Ceramics PWG

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.