Abstract
Silicon K- and L 2,3-edge XANES of α-quartz and stishovite are reported. The XANES spectra reveal the densities of the unoccupied Si 3s, 3p and 3d states in the band gap and the conduction band, and demonstrate the large difference in the bonding of 4:2 coordinate α-quartz and 6:3 coordinate stishovite. The Si K- and L 2,3-edge shifts are also systematically related to the coordination of Si, Si-O bond length, Si-Si distance, Si-O-Si angle, Si-O bond valence and Si NMR chemical shift of α-quartz and stishovite. These XANES spectra may be used as a fingerprint in studying the structure of silicate glasses and melts.
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