Claude Benoit

Signature of small rings in the Raman spectra of normal and compressed amorphous silica: A combined classical and ab initio study

We calculate the parallel (VV) and (VH) perpendicular polarized Raman spectra of amorphous silica. Model

Numerical study of the dynamic properties of silica aerogels

{\mathrm{SiO}}_{2}

Dynamical properties of a diffusion-limited cluster - cluster aggregation model

glasses, uncompressed and compressed, were generated by a combination of classical and ab initio molecular-dynamics simulations and their dynamical matrices were computed within the framework of the density-functional theory. The Raman-scattering intensities were determined using the bond-polarizability model and a good agreement with experimental spectra was found. We confirm that the modes associated to the fourfold and threefold rings produce most of the Raman intensity of the

Determination of the Green functions for systems with large asymmetric matrices by the moments method

{D}_{1}

A fractal model for silica aerogels

and

Introduction of fractal absorbing boundary conditions in electromagnetic simulation by SMM

{D}_{2}

Light scattering in fractals with scalar and bond-bending models

peaks, respectively, in the VV Raman spectra. Modifications of the Raman spectra upon compression are found to be in agreement with experimental data. We show that the modes associated to the fourfold rings still exist upon compression but do not produce a strong Raman intensity, whereas the ones associated to the threefold rings do. This result strongly suggests that the area under the

Numerical study of electromagnetic wave propagation in twisted birefringent layers by the spectral moments method

{D}_{1}

Elastic wave-propagation simulation in heterogeneous media by the spectral moments method

and

Introduction of artificial boundary conditions in the spectral moments method

{D}_{2}