Structure of densified vitreous silica: Silicon and oxygen XANES spectra and multiple scattering calculations. Davoli, I., Paris, E., Stizza, S., Benfatto, M., Fanfoni, M., Gargano, A., Bianconi, A., & Seifert, F. *Physics and Chemistry of Minerals*, 19(3):171–175, 1992. Paper doi abstract bibtex The decrease of the mean Si-O-Si angle in vitreous silica upon densification from 2.20 to 2.36 gcm-3 has been followed by oxygen and silicon K-edge XANES spectroscopy. Multiple scattering calculations using clusters of two shells around the oxygen and silicon atoms, respectively, are in good agreement with experimental absorption spectra and confirm mean Si-O-Si angles between 130 and 144° for these samples, and a decrease of the mean angle with densification. The experimental spectra also exhibit features due to scattering at outer (\textgreater2) shells around the photoabsorbers.

@article{davoli_structure_1992,
title = {Structure of densified vitreous silica: {Silicon} and oxygen {XANES} spectra and multiple scattering calculations},
volume = {19},
issn = {0342-1791},
url = {http://dx.doi.org/10.1007/bf00202105},
doi = {10.1007/bf00202105},
abstract = {The decrease of the mean Si-O-Si angle in vitreous silica upon densification from 2.20 to 2.36 gcm-3 has been followed by oxygen and silicon K-edge XANES spectroscopy. Multiple scattering calculations using clusters of two shells around the oxygen and silicon atoms, respectively, are in good agreement with experimental absorption spectra and confirm mean Si-O-Si angles between 130 and 144° for these samples, and a decrease of the mean angle with densification. The experimental spectra also exhibit features due to scattering at outer ({\textgreater}2) shells around the photoabsorbers.},
number = {3},
journal = {Physics and Chemistry of Minerals},
author = {Davoli, I. and Paris, E. and Stizza, S. and Benfatto, M. and Fanfoni, M. and Gargano, A. and Bianconi, A. and Seifert, F.},
year = {1992},
pages = {171--175}
}

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