X-ray absorptions spectra of quartz (10 1 0), pure silica and densified silica under pressure have been recorded at the silicon and oxygen K-edges. The spectra of quartz show intense polarization effects which have been interpreted on the single scattering approximation, using geometrical considerations. The comparison between the spectra of silica and densified silica, on the basis of this interpretation, gives some information on the structural effect suffered by the silica network under pressure.
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Lagarde et al. (1992) studied this question.