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We present a theoretical interpretation of the L"3","2-edge XANES
(X-ray Absorption Near Edge Structure) spectra of un-doped and zinc-doped
As"2Se"3 glasses. L"3","2-edge XANES of glasses with compositions,
(As"2Se"3)"1"0"0"-"x(Zn)"x (x=3, 5, 7, 10) and (As"2Se"3)"1"0"0"-"y
(ZnSe)"y (y=5, 20), have also been obtained experimentally. The
experimental L"3","2-edge spectra of As and Se are compared to the
theoretically calculated spectra by two ab-initio methods: the
self-consistent methods of DFT (Density Functional Theory) and RSMS (Real
Space Multiple Scattering). The effect of morphology (powder vs. thin film)
and the addition of Zn are also demonstrated by valence band obtained from
XPS (X-ray Photoelectron Spectroscopy) spectra. The effects of the cluster
size and the doping of Zn into the As"2Se"3 have also been simulated for
the L"3","2-edge XANES.
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