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Spectroscopy as a tool for local density measurement in vitreous silica
Coralie Weigel  1@  , Marie Foret  2@  , Bernard Hehlen  1@  , Benoit Rufflé  3@  
1 : Laboratoire Charles Coulomb  (L2C)  -  Website
Université Montpellier II - Sciences et techniques, CNRS : UMR5221
1 place Eugène Bataillon Université Montpellier II 34095 Montpellier Cedex 5 -  France
2 : Institut Charles Coulomb
Université Montpellier
3 : Laboratoire Charles Coulomb  (L2C)  -  Website
CNRS : UMR5221, Université de Montpellier
1 place Eugène Bataillon Université Montpellier II 34095 Montpellier Cedex 5 -  France

The paper will discuss the possibility for light spectroscopies, e.g. Brillouin Light Scattering or Raman Scattering, to locally monitor the densification of amorphous silica. It is indeed well-known that silica significantly densifies under high stresses, either elastically as for example during a high-pressure experiment in a diamond-anvil cell below about 10 GPa or plastically above that limit. Further, this elastic limit strongly depends on the temperature. Irradiation-induced density changes are also observed using ultra-short laser pulses, neutrons or other particles. All these different routes lead to substantial structural modifications which in turn alter the response of silica to light spectroscopy in a complex manner.


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