, rares dans les espaces interstitiels bloque ce processus de restructuration microscopique

. Enfin, on réalise ici pour la première fois l'analyse de la polarisation des spectres

, Elle révèle que dans la région en dessous de 200 cm ?1 correspondant au pic boson, les composantes VV et VH du spectre Raman évo-luent différemment avec la pression

, Modules élastiques et masse volumique de v-SiO 2 sous pression d'hélium et de ME4:1

, Variations volumiques de la silice vitreuse en fonction de la pression et différents milieux transmetteurs de pression

, Vitesses du son de v-SiO 2 comprimée dans He

, Modules élastiques de v-SiO 2 sous pression de néon et concentration de néon

, Variations du volume relatif de v-SiO 2 en fonction du temps à pression constante

, Propagation du front de diffusion de néon dans un échantillon de v-SiO 2, p.52

, Courbes d'adsorption et de désorption de néon à 2,1 GPa, p.54

, Extrapolation des courbes de fréquences aux pressions négatives, p.56

, Variations à l'équilibre et cinétique de la fréquence Brillouin LA de v-SiO 2 en fonction de la pression

, Dépendance en pression du module de compression du modèle de silice, p.61

, Isothermes d'adsorption à température ambiante dans v-SiO 2 obtenues par simulations GCMC en fonction de la pression du fluide, p.63

, Déformation volumique de v-SiO 2 en fonction de la pression exercée par des fluides pénétrants

, Concentration de fluide adsorbé dans v-SiO 2 obtenues par simulations numériques

, Spectroscopies vibrationnelles de v-SiO 2 à pression ambiante, p.70

.. .. Modes-de-vibration-raman,

, Densités d'états vibrationnels de v-SiO

, OM : microscope optique. -FI : filtre interférentiel. -?/2 : lame demi-onde. -FS :filtre spatial, vol.2

, Positionnement du volume diffusant dans les expériences de diffusion Raman

, Spectres Raman typiques VV et VH de v-Si0

V. V. Intensité-raman and . .. De-pressurisation, 81 2.8 Intensité spectrale transmise par le spectrographe et spectres Raman VV et VH corrigés

, Intensité Raman réduite VV et VH (I RS N /? 2 ) de v-SiO 2 sous pression d'argon, p.85

. Intensité-raman-réduite, . Vv, and . Vh-(i-rs-n, 86 2.11 Fréquence de la bande R avec la densité (a) et comparaison de deux spectres Raman VV obtenus pour v-SiO 2

, Modèle simple des vibrations couplées du motif A ? X ? A dans les structures tétraédriques AX 2 en fonction de l'angle inter-tétraèdrique, p.89

, Fréquence des modes TO 2 et TO 3 en fonction de la pression et de la densité atomique

A. , Courbes d'adsorption et de désorption de néon à 1,2 GPa, p.98

, Courbes d'adsorption et de désorption de néon à 2 GPa, p.99

A. , Courbes d'adsorption et de désorption de néon à 4,2 GPa, p.100

, Intensité Raman réduite VV et VH (I RS N /? 2 ) de v-SiO 2 sous pression d

. Intensité-raman-réduite, . Vv, and . Vh-(i-rs-n, /? 2 ) de v-SiO 2 sous pression d'hé-lium

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